diff --git a/src/GitVersionCore.Tests/IntegrationTests/MainlineDevelopmentMode.cs b/src/GitVersionCore.Tests/IntegrationTests/MainlineDevelopmentMode.cs
index 28daf7d29b..220206c322 100644
--- a/src/GitVersionCore.Tests/IntegrationTests/MainlineDevelopmentMode.cs
+++ b/src/GitVersionCore.Tests/IntegrationTests/MainlineDevelopmentMode.cs
@@ -20,6 +20,24 @@ public class MainlineDevelopmentMode : TestBase
             VersioningMode = VersioningMode.Mainline
         };
 
+        [Test]
+        public void VerifyNonMasterMainlineVersionIdenticalAsMaster()
+        {
+            using var fixture = new EmptyRepositoryFixture();
+            fixture.Repository.MakeACommit("1");
+
+            fixture.BranchTo("feature/foo", "foo");
+            fixture.MakeACommit("2 +semver: major");
+            fixture.Checkout("master");
+            fixture.MergeNoFF("feature/foo");
+
+            fixture.AssertFullSemver("1.0.0", config);
+
+            fixture.BranchTo("support/1.0", "support");
+
+            fixture.AssertFullSemver("1.0.0", config);
+        }
+
         [Test]
         public void MergedFeatureBranchesToMasterImpliesRelease()
         {
@@ -117,7 +135,7 @@ public void SupportBranches()
             fixture.AssertFullSemver("1.0.2", config);
 
             fixture.BranchTo("support/1.0", "support10");
-            fixture.AssertFullSemver("1.0.3", config);
+            fixture.AssertFullSemver("1.0.2", config);
 
             // Move master on
             fixture.Checkout("master");
@@ -126,9 +144,9 @@ public void SupportBranches()
 
             // Continue on support/1.0
             fixture.Checkout("support/1.0");
+            fixture.MakeACommit(); // 1.0.3
             fixture.MakeACommit(); // 1.0.4
-            fixture.MakeACommit(); // 1.0.5
-            fixture.AssertFullSemver("1.0.5", config);
+            fixture.AssertFullSemver("1.0.4", config);
             fixture.BranchTo("feature/foo", "foo");
             fixture.AssertFullSemver("1.0.5-foo.0", config);
             fixture.MakeACommit();
@@ -185,7 +203,7 @@ public void VerifySupportForwardMerge()
             fixture.MakeACommit();
             fixture.AssertFullSemver("1.1.2", config);
             fixture.Checkout("support/1.0");
-            fixture.AssertFullSemver("1.0.4", config);
+            fixture.AssertFullSemver("1.0.3", config);
 
             fixture.BranchTo("feature/foo", "foo");
             fixture.MakeACommit();
diff --git a/src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs b/src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs
index 4d97809a05..e094810504 100644
--- a/src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs
+++ b/src/GitVersionCore/VersionCalculation/MainlineVersionCalculator.cs
@@ -69,7 +69,7 @@ public SemanticVersion FindMainlineModeVersion(BaseVersion baseVersion)
                 mainlineVersion.BuildMetaData = CreateVersionBuildMetaData(mergeBase);
 
                 // branches other than master always get a bump for the act of branching
-                if (context.CurrentBranch.FriendlyName != "master")
+                if (!context.CurrentBranch.IsSameBranch(mainline))
                 {
                     var branchIncrement = FindMessageIncrement(null, context.CurrentCommit, mergeBase, mainlineCommitLog);
                     log.Info($"Performing {branchIncrement} increment for current branch ");