diff --git a/lib/platform/azure/index.spec.ts b/lib/platform/azure/index.spec.ts
index 3096999880..76ba7745d9 100644
--- a/lib/platform/azure/index.spec.ts
+++ b/lib/platform/azure/index.spec.ts
@@ -1080,7 +1080,10 @@ describe(getName(), () => {
         .fn()
         .mockReturnValue(GitPullRequestMergeStrategy.Squash);
 
-      const res = await azure.mergePr(pullRequestIdMock, branchNameMock);
+      const res = await azure.mergePr({
+        branchName: branchNameMock,
+        id: pullRequestIdMock,
+      });
 
       expect(updatePullRequestMock).toHaveBeenCalledWith(
         {
@@ -1118,7 +1121,10 @@ describe(getName(), () => {
         .fn()
         .mockReturnValue(GitPullRequestMergeStrategy.Squash);
 
-      const res = await azure.mergePr(pullRequestIdMock, branchNameMock);
+      const res = await azure.mergePr({
+        branchName: branchNameMock,
+        id: pullRequestIdMock,
+      });
       expect(res).toBe(false);
     });
 
@@ -1138,8 +1144,14 @@ describe(getName(), () => {
         .fn()
         .mockReturnValue(GitPullRequestMergeStrategy.Squash);
 
-      await azure.mergePr(1234, 'test-branch-1');
-      await azure.mergePr(5678, 'test-branch-2');
+      await azure.mergePr({
+        branchName: 'test-branch-1',
+        id: 1234,
+      });
+      await azure.mergePr({
+        branchName: 'test-branch-2',
+        id: 5678,
+      });
 
       expect(azureHelper.getMergeMethod).toHaveBeenCalledTimes(1);
     });
@@ -1167,7 +1179,10 @@ describe(getName(), () => {
         .fn()
         .mockReturnValue(GitPullRequestMergeStrategy.Squash);
 
-      const res = await azure.mergePr(pullRequestIdMock, branchNameMock);
+      const res = await azure.mergePr({
+        branchName: branchNameMock,
+        id: pullRequestIdMock,
+      });
 
       expect(getPullRequestByIdMock).toHaveBeenCalledTimes(2);
       expect(res).toBe(true);
@@ -1197,7 +1212,10 @@ describe(getName(), () => {
         .fn()
         .mockReturnValue(GitPullRequestMergeStrategy.Squash);
 
-      const res = await azure.mergePr(pullRequestIdMock, branchNameMock);
+      const res = await azure.mergePr({
+        branchName: branchNameMock,
+        id: pullRequestIdMock,
+      });
 
       expect(getPullRequestByIdMock).toHaveBeenCalledTimes(
         expectedNumRetries + 1
diff --git a/lib/platform/azure/index.ts b/lib/platform/azure/index.ts
index 6abee9274b..27efa59485 100644
--- a/lib/platform/azure/index.ts
+++ b/lib/platform/azure/index.ts
@@ -24,6 +24,7 @@ import type {
   EnsureIssueResult,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   PlatformParams,
   PlatformResult,
   Pr,
@@ -608,10 +609,10 @@ export async function setBranchStatus({
   logger.trace(`Created commit status of ${state} on branch ${branchName}`);
 }
 
-export async function mergePr(
-  pullRequestId: number,
-  branchName: string
-): Promise<boolean> {
+export async function mergePr({
+  branchName,
+  id: pullRequestId,
+}: MergePRConfig): Promise<boolean> {
   logger.debug(`mergePr(${pullRequestId}, ${branchName})`);
   const azureApiGit = await azureApi.gitApi();
 
diff --git a/lib/platform/bitbucket-server/index.spec.ts b/lib/platform/bitbucket-server/index.spec.ts
index cb747f2e03..2d39843c40 100644
--- a/lib/platform/bitbucket-server/index.spec.ts
+++ b/lib/platform/bitbucket-server/index.spec.ts
@@ -1598,13 +1598,21 @@ describe(getName(), () => {
             )
             .reply(200);
 
-          expect(await bitbucket.mergePr(5, 'branch')).toBe(true);
+          expect(
+            await bitbucket.mergePr({
+              branchName: 'branch',
+              id: 5,
+            })
+          ).toBe(true);
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
 
         it('throws not-found 1', async () => {
           await initRepo();
-          const res = bitbucket.mergePr(null as any, 'branch');
+          const res = bitbucket.mergePr({
+            branchName: 'branch',
+            id: null as any,
+          });
           await expect(res).rejects.toThrow(REPOSITORY_NOT_FOUND);
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
@@ -1617,9 +1625,12 @@ describe(getName(), () => {
             )
             .reply(404);
 
-          await expect(bitbucket.mergePr(4, 'branch')).rejects.toThrow(
-            REPOSITORY_NOT_FOUND
-          );
+          await expect(
+            bitbucket.mergePr({
+              branchName: 'branch',
+              id: 4,
+            })
+          ).rejects.toThrow(REPOSITORY_NOT_FOUND);
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
 
@@ -1639,9 +1650,12 @@ describe(getName(), () => {
             )
             .reply(404);
 
-          await expect(bitbucket.mergePr(5, 'branch')).rejects.toThrow(
-            REPOSITORY_NOT_FOUND
-          );
+          await expect(
+            bitbucket.mergePr({
+              branchName: 'branch',
+              id: 5,
+            })
+          ).rejects.toThrow(REPOSITORY_NOT_FOUND);
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
 
@@ -1661,7 +1675,12 @@ describe(getName(), () => {
             )
             .reply(409);
 
-          expect(await bitbucket.mergePr(5, 'branch')).toBeFalsy();
+          expect(
+            await bitbucket.mergePr({
+              branchName: 'branch',
+              id: 5,
+            })
+          ).toBeFalsy();
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
 
@@ -1681,7 +1700,12 @@ describe(getName(), () => {
             )
             .reply(405);
 
-          await expect(bitbucket.mergePr(5, 'branch')).resolves.toBe(false);
+          await expect(
+            bitbucket.mergePr({
+              branchName: 'branch',
+              id: 5,
+            })
+          ).resolves.toBe(false);
           expect(httpMock.getTrace()).toMatchSnapshot();
         });
       });
diff --git a/lib/platform/bitbucket-server/index.ts b/lib/platform/bitbucket-server/index.ts
index c79ba4b4e1..44bc93d61a 100644
--- a/lib/platform/bitbucket-server/index.ts
+++ b/lib/platform/bitbucket-server/index.ts
@@ -31,6 +31,7 @@ import type {
   EnsureIssueResult,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   PlatformParams,
   PlatformResult,
   Pr,
@@ -962,10 +963,10 @@ export async function updatePr({
 }
 
 // https://docs.atlassian.com/bitbucket-server/rest/6.0.0/bitbucket-rest.html#idp261
-export async function mergePr(
-  prNo: number,
-  branchName: string
-): Promise<boolean> {
+export async function mergePr({
+  branchName,
+  id: prNo,
+}: MergePRConfig): Promise<boolean> {
   logger.debug(`mergePr(${prNo}, ${branchName})`);
   // Used for "automerge" feature
   try {
diff --git a/lib/platform/bitbucket/index.spec.ts b/lib/platform/bitbucket/index.spec.ts
index 1959e1f1fe..cad5cd8e66 100644
--- a/lib/platform/bitbucket/index.spec.ts
+++ b/lib/platform/bitbucket/index.spec.ts
@@ -815,40 +815,63 @@ describe(getName(), () => {
     it('posts Merge with optional merge strategy', async () => {
       const scope = await initRepoMock();
       scope.post('/2.0/repositories/some/repo/pullrequests/5/merge').reply(200);
-      await bitbucket.mergePr(5, 'branch');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
 
     it('posts Merge with auto', async () => {
       const scope = await initRepoMock();
       scope.post('/2.0/repositories/some/repo/pullrequests/5/merge').reply(200);
-      await bitbucket.mergePr(5, 'branch', 'auto');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+        strategy: 'auto',
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
 
     it('posts Merge with merge-commit', async () => {
       const scope = await initRepoMock();
       scope.post('/2.0/repositories/some/repo/pullrequests/5/merge').reply(200);
-      await bitbucket.mergePr(5, 'branch', 'merge-commit');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+        strategy: 'merge-commit',
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
 
     it('posts Merge with squash', async () => {
       const scope = await initRepoMock();
       scope.post('/2.0/repositories/some/repo/pullrequests/5/merge').reply(200);
-      await bitbucket.mergePr(5, 'branch', 'squash');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+        strategy: 'squash',
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
 
     it('does not post Merge with rebase', async () => {
-      await bitbucket.mergePr(5, 'branch', 'rebase');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+        strategy: 'rebase',
+      });
       expect(httpMock.getTrace()).toEqual([]);
     });
 
     it('posts Merge with fast-forward', async () => {
       const scope = await initRepoMock();
       scope.post('/2.0/repositories/some/repo/pullrequests/5/merge').reply(200);
-      await bitbucket.mergePr(5, 'branch', 'fast-forward');
+      await bitbucket.mergePr({
+        branchName: 'branch',
+        id: 5,
+        strategy: 'fast-forward',
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
   });
diff --git a/lib/platform/bitbucket/index.ts b/lib/platform/bitbucket/index.ts
index 5699528b54..1639870df0 100644
--- a/lib/platform/bitbucket/index.ts
+++ b/lib/platform/bitbucket/index.ts
@@ -1,7 +1,6 @@
 import URL from 'url';
 import is from '@sindresorhus/is';
 import parseDiff from 'parse-diff';
-import type { MergeStrategy } from '../../config/types';
 import { REPOSITORY_NOT_FOUND } from '../../constants/error-messages';
 import { PLATFORM_TYPE_BITBUCKET } from '../../constants/platforms';
 import { logger } from '../../logger';
@@ -19,6 +18,7 @@ import type {
   EnsureIssueResult,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   PlatformParams,
   PlatformResult,
   Pr,
@@ -747,11 +747,11 @@ export async function updatePr({
   }
 }
 
-export async function mergePr(
-  prNo: number,
-  branchName: string,
-  mergeStrategy: MergeStrategy
-): Promise<boolean> {
+export async function mergePr({
+  branchName,
+  id: prNo,
+  strategy: mergeStrategy,
+}: MergePRConfig): Promise<boolean> {
   logger.debug(`mergePr(${prNo}, ${branchName}, ${mergeStrategy})`);
 
   // Bitbucket Cloud does not support a rebase-alike; https://jira.atlassian.com/browse/BCLOUD-16610
diff --git a/lib/platform/gitea/index.spec.ts b/lib/platform/gitea/index.spec.ts
index 6a0ade67ca..058aed3ef8 100644
--- a/lib/platform/gitea/index.spec.ts
+++ b/lib/platform/gitea/index.spec.ts
@@ -899,7 +899,12 @@ describe(getName(), () => {
     it('should return true when merging succeeds', async () => {
       await initFakeRepo();
 
-      expect(await gitea.mergePr(1, 'some-branch')).toEqual(true);
+      expect(
+        await gitea.mergePr({
+          branchName: 'some-branch',
+          id: 1,
+        })
+      ).toEqual(true);
       expect(helper.mergePR).toHaveBeenCalledTimes(1);
       expect(helper.mergePR).toHaveBeenCalledWith(
         mockRepo.full_name,
@@ -912,7 +917,12 @@ describe(getName(), () => {
       helper.mergePR.mockRejectedValueOnce(new Error());
       await initFakeRepo();
 
-      expect(await gitea.mergePr(1, 'some-branch')).toEqual(false);
+      expect(
+        await gitea.mergePr({
+          branchName: 'some-branch',
+          id: 1,
+        })
+      ).toEqual(false);
     });
   });
 
diff --git a/lib/platform/gitea/index.ts b/lib/platform/gitea/index.ts
index ab669e05a6..c7d831e6b0 100644
--- a/lib/platform/gitea/index.ts
+++ b/lib/platform/gitea/index.ts
@@ -25,6 +25,7 @@ import type {
   EnsureIssueConfig,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   Platform,
   PlatformParams,
   PlatformResult,
@@ -563,12 +564,12 @@ const platform: Platform = {
     });
   },
 
-  async mergePr(number: number, branchName: string): Promise<boolean> {
+  async mergePr({ id }: MergePRConfig): Promise<boolean> {
     try {
-      await helper.mergePR(config.repository, number, config.mergeMethod);
+      await helper.mergePR(config.repository, id, config.mergeMethod);
       return true;
     } catch (err) {
-      logger.warn({ err, number }, 'Merging of PR failed');
+      logger.warn({ err, id }, 'Merging of PR failed');
       return false;
     }
   },
diff --git a/lib/platform/github/index.spec.ts b/lib/platform/github/index.spec.ts
index f0e2e51b73..ab4fdc442e 100644
--- a/lib/platform/github/index.spec.ts
+++ b/lib/platform/github/index.spec.ts
@@ -2040,7 +2040,12 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      expect(await github.mergePr(pr.number, '')).toBe(true);
+      expect(
+        await github.mergePr({
+          branchName: '',
+          id: pr.number,
+        })
+      ).toBe(true);
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
     it('should handle merge error', async () => {
@@ -2056,7 +2061,12 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      expect(await github.mergePr(pr.number, '')).toBe(false);
+      expect(
+        await github.mergePr({
+          branchName: '',
+          id: pr.number,
+        })
+      ).toBe(false);
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
   });
@@ -2104,7 +2114,12 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      expect(await github.mergePr(pr.number, '')).toBe(true);
+      expect(
+        await github.mergePr({
+          branchName: '',
+          id: pr.number,
+        })
+      ).toBe(true);
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
     it('should try squash after rebase', async () => {
@@ -2120,7 +2135,10 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      await github.mergePr(pr.number, '');
+      await github.mergePr({
+        branchName: '',
+        id: pr.number,
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
     it('should try merge after squash', async () => {
@@ -2140,7 +2158,12 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      expect(await github.mergePr(pr.number, '')).toBe(true);
+      expect(
+        await github.mergePr({
+          branchName: '',
+          id: pr.number,
+        })
+      ).toBe(true);
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
     it('should give up', async () => {
@@ -2162,7 +2185,12 @@ describe(getName(), () => {
           ref: 'someref',
         },
       };
-      expect(await github.mergePr(pr.number, '')).toBe(false);
+      expect(
+        await github.mergePr({
+          branchName: '',
+          id: pr.number,
+        })
+      ).toBe(false);
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
   });
diff --git a/lib/platform/github/index.ts b/lib/platform/github/index.ts
index 469e7b5493..20a5942b5d 100644
--- a/lib/platform/github/index.ts
+++ b/lib/platform/github/index.ts
@@ -34,6 +34,7 @@ import type {
   EnsureIssueResult,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   PlatformResult,
   Pr,
   RepoParams,
@@ -1477,10 +1478,10 @@ export async function updatePr({
   }
 }
 
-export async function mergePr(
-  prNo: number,
-  branchName: string
-): Promise<boolean> {
+export async function mergePr({
+  branchName,
+  id: prNo,
+}: MergePRConfig): Promise<boolean> {
   logger.debug(`mergePr(${prNo}, ${branchName})`);
   // istanbul ignore if
   if (config.prReviewsRequired) {
diff --git a/lib/platform/gitlab/index.spec.ts b/lib/platform/gitlab/index.spec.ts
index b293bcf761..63c849fe31 100644
--- a/lib/platform/gitlab/index.spec.ts
+++ b/lib/platform/gitlab/index.spec.ts
@@ -1796,7 +1796,9 @@ describe(getName(), () => {
         .scope(gitlabApiHost)
         .put('/api/v4/projects/undefined/merge_requests/1/merge')
         .reply(200);
-      await gitlab.mergePr(1, undefined);
+      await gitlab.mergePr({
+        id: 1,
+      });
       expect(httpMock.getTrace()).toMatchSnapshot();
     });
   });
diff --git a/lib/platform/gitlab/index.ts b/lib/platform/gitlab/index.ts
index d8c1f89d92..175c0a81b1 100644
--- a/lib/platform/gitlab/index.ts
+++ b/lib/platform/gitlab/index.ts
@@ -31,6 +31,7 @@ import type {
   EnsureIssueConfig,
   FindPRConfig,
   Issue,
+  MergePRConfig,
   PlatformParams,
   PlatformPrOptions,
   PlatformResult,
@@ -606,10 +607,10 @@ export async function updatePr({
   await tryPrAutomerge(iid, platformOptions);
 }
 
-export async function mergePr(iid: number): Promise<boolean> {
+export async function mergePr({ id }: MergePRConfig): Promise<boolean> {
   try {
     await gitlabApi.putJson(
-      `projects/${config.repository}/merge_requests/${iid}/merge`,
+      `projects/${config.repository}/merge_requests/${id}/merge`,
       {
         body: {
           should_remove_source_branch: true,
diff --git a/lib/platform/types.ts b/lib/platform/types.ts
index 3a9cc08bab..020247e955 100644
--- a/lib/platform/types.ts
+++ b/lib/platform/types.ts
@@ -117,6 +117,11 @@ export interface FindPRConfig {
   state?: PrState.Open | PrState.Closed | PrState.NotOpen | PrState.All;
   refreshCache?: boolean;
 }
+export interface MergePRConfig {
+  branchName?: string;
+  id: number;
+  strategy?: MergeStrategy;
+}
 export interface EnsureCommentConfig {
   number: number;
   topic: string;
@@ -154,11 +159,7 @@ export interface Platform {
   ): Promise<EnsureIssueResult | null>;
   massageMarkdown(prBody: string): string;
   updatePr(prConfig: UpdatePrConfig): Promise<void>;
-  mergePr(
-    number: number,
-    branchName: string,
-    mergeStrategy?: MergeStrategy
-  ): Promise<boolean>;
+  mergePr(config: MergePRConfig): Promise<boolean>;
   addReviewers(number: number, reviewers: string[]): Promise<void>;
   addAssignees(number: number, assignees: string[]): Promise<void>;
   createPr(prConfig: CreatePRConfig): Promise<Pr>;
diff --git a/lib/workers/pr/automerge.ts b/lib/workers/pr/automerge.ts
index b1c5af8fc1..cb4f84764a 100644
--- a/lib/workers/pr/automerge.ts
+++ b/lib/workers/pr/automerge.ts
@@ -109,7 +109,11 @@ export async function checkAutoMerge(
     };
   }
   logger.debug(`Automerging #${pr.number} with strategy ${automergeStrategy}`);
-  const res = await platform.mergePr(pr.number, branchName, automergeStrategy);
+  const res = await platform.mergePr({
+    branchName,
+    id: pr.number,
+    strategy: automergeStrategy,
+  });
   if (res) {
     logger.info({ pr: pr.number, prTitle: pr.title }, 'PR automerged');
     let branchRemoved = false;