diff --git a/lib/platform/gitlab/index.js b/lib/platform/gitlab/index.js
index 11d036d6fe..e90c2ccc6c 100644
--- a/lib/platform/gitlab/index.js
+++ b/lib/platform/gitlab/index.js
@@ -382,9 +382,9 @@ function addReviewers(iid, reviewers) {
 }
 
 async function getComments(issueNo) {
-  // GET https://gitlab.com/api/v4/projects/:owner/:repo/merge_requests/:number/notes
+  // GET /api/v4/projects/:owner/:repo/merge_requests/:number/notes
   logger.debug(`Getting comments for #${issueNo}`);
-  const url = `https://gitlab.com/api/v4/projects/${
+  const url = `/api/v4/projects/${
     config.repository
   }/merge_requests/${issueNo}/notes`;
   const comments = (await get(url, { paginate: true })).body;
@@ -393,11 +393,9 @@ async function getComments(issueNo) {
 }
 
 async function addComment(issueNo, body) {
-  // POST https://gitlab.com/api/v4/projects/:owner/:repo/merge_requests/:number/notes
+  // POST /api/v4/projects/:owner/:repo/merge_requests/:number/notes
   await get.post(
-    `https://gitlab.com/api/v4/projects/${
-      config.repository
-    }/merge_requests/${issueNo}/notes`,
+    `/api/v4/projects/${config.repository}/merge_requests/${issueNo}/notes`,
     {
       body: { body },
     }
@@ -405,9 +403,9 @@ async function addComment(issueNo, body) {
 }
 
 async function editComment(issueNo, commentId, body) {
-  // PATCH https://gitlab.com/api/v4/projects/:owner/:repo/merge_requests/:number/notes/:id
+  // PATCH /api/v4/projects/:owner/:repo/merge_requests/:number/notes/:id
   await get.patch(
-    `https://gitlab.com/api/v4/projects/${
+    `/api/v4/projects/${
       config.repository
     }/merge_requests/${issueNo}/notes/${commentId}`,
     {
@@ -417,9 +415,9 @@ async function editComment(issueNo, commentId, body) {
 }
 
 async function deleteComment(issueNo, commentId) {
-  // DELETE https://gitlab.com/api/v4/projects/:owner/:repo/merge_requests/:number/notes/:id
+  // DELETE /api/v4/projects/:owner/:repo/merge_requests/:number/notes/:id
   await get.delete(
-    `https://gitlab.com/api/v4/projects/${
+    `/api/v4/projects/${
       config.repository
     }/merge_requests/${issueNo}/notes/${commentId}`
   );
diff --git a/test/platform/gitlab/__snapshots__/index.spec.js.snap b/test/platform/gitlab/__snapshots__/index.spec.js.snap
index 231763b493..26034a9fcd 100644
--- a/test/platform/gitlab/__snapshots__/index.spec.js.snap
+++ b/test/platform/gitlab/__snapshots__/index.spec.js.snap
@@ -127,7 +127,7 @@ Array [
 exports[`platform/gitlab ensureComment add comment if not found 1`] = `
 Array [
   Array [
-    "https://gitlab.com/api/v4/projects/some%2Frepo/merge_requests/42/notes",
+    "/api/v4/projects/some%2Frepo/merge_requests/42/notes",
     Object {
       "body": Object {
         "body": "### some-subject
@@ -143,7 +143,7 @@ content",
 exports[`platform/gitlab ensureComment add updates comment if necessary 1`] = `
 Array [
   Array [
-    "https://gitlab.com/api/v4/projects/some%2Frepo/merge_requests/42/notes/1234",
+    "/api/v4/projects/some%2Frepo/merge_requests/42/notes/1234",
     Object {
       "body": Object {
         "body": "### some-subject