diff --git a/.gitignore b/.gitignore
index 3e759b7..4bda13b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,6 +12,8 @@
 # User-specific files (MonoDevelop/Xamarin Studio)
 *.userprefs
 
+tempkey.rsa
+
 # Build results
 [Dd]ebug/
 [Dd]ebugPublic/
diff --git a/src/Startup.cs b/src/Startup.cs
index c3b6b2c..9944d00 100644
--- a/src/Startup.cs
+++ b/src/Startup.cs
@@ -37,6 +37,7 @@ namespace SteamOpenIdConnectProxy
                 .AddAspNetIdentity<IdentityUser>()
                 .AddInMemoryClients(IdentityServerConfig.GetClients(Configuration["OpenID:ClientID"], Configuration["OpenID:ClientSecret"], Configuration["OpenID:RedirectUri"], Configuration["OpenID:PostLogoutRedirectUri"]))
                 .AddInMemoryPersistedGrants()
+                .AddDeveloperSigningCredential(true)
                 .AddInMemoryIdentityResources(IdentityServerConfig.GetIdentityResources());
 
             services.AddAuthentication()