diff --git a/pkg/commands/git_commands/commit_loader.go b/pkg/commands/git_commands/commit_loader.go
index 643a7c184..f116ded1f 100644
--- a/pkg/commands/git_commands/commit_loader.go
+++ b/pkg/commands/git_commands/commit_loader.go
@@ -103,9 +103,9 @@ func (self *CommitLoader) GetCommits(opts GetCommitsOptions) ([]*models.Commit,
 	go utils.Safe(func() {
 		defer wg.Done()
 
-		ancestor = self.getMergeBase(opts.RefName, opts.MainBranches)
+		ancestor = opts.MainBranches.GetMergeBase(opts.RefName)
 		if opts.RefToShowDivergenceFrom != "" {
-			remoteAncestor = self.getMergeBase(opts.RefToShowDivergenceFrom, opts.MainBranches)
+			remoteAncestor = opts.MainBranches.GetMergeBase(opts.RefToShowDivergenceFrom)
 		}
 	})
 
@@ -466,29 +466,6 @@ func setCommitMergedStatuses(ancestor string, commits []*models.Commit) {
 	}
 }
 
-func (self *CommitLoader) getMergeBase(refName string, existingMainBranches *ExistingMainBranches) string {
-	mainBranches := existingMainBranches.Get()
-	if len(mainBranches) == 0 {
-		return ""
-	}
-
-	// We pass all configured main branches to the merge-base call; git will
-	// return the base commit for the closest one.
-
-	// We ignore errors from this call, since we can't distinguish whether the
-	// error is because one of the main branches has been deleted since the last
-	// call to determineMainBranches, or because the refName has no common
-	// history with any of the main branches. Since the former should happen
-	// very rarely, users must quit and restart lazygit to fix it; the latter is
-	// also not very common, but can totally happen and is not an error.
-
-	output, _ := self.cmd.New(
-		NewGitCmd("merge-base").Arg(refName).Arg(mainBranches...).
-			ToArgv(),
-	).DontLog().RunWithOutput()
-	return ignoringWarnings(output)
-}
-
 func ignoringWarnings(commandOutput string) string {
 	trimmedOutput := strings.TrimSpace(commandOutput)
 	split := strings.Split(trimmedOutput, "\n")
diff --git a/pkg/commands/git_commands/main_branches.go b/pkg/commands/git_commands/main_branches.go
index f8b8b85f2..341232b04 100644
--- a/pkg/commands/git_commands/main_branches.go
+++ b/pkg/commands/git_commands/main_branches.go
@@ -47,6 +47,30 @@ func (self *MainBranches) Get() []string {
 	return self.existingMainBranches
 }
 
+// Return the merge base of the given refName with the closest main branch.
+func (self *MainBranches) GetMergeBase(refName string) string {
+	mainBranches := self.Get()
+	if len(mainBranches) == 0 {
+		return ""
+	}
+
+	// We pass all existing main branches to the merge-base call; git will
+	// return the base commit for the closest one.
+
+	// We ignore errors from this call, since we can't distinguish whether the
+	// error is because one of the main branches has been deleted since the last
+	// call to determineMainBranches, or because the refName has no common
+	// history with any of the main branches. Since the former should happen
+	// very rarely, users must quit and restart lazygit to fix it; the latter is
+	// also not very common, but can totally happen and is not an error.
+
+	output, _ := self.cmd.New(
+		NewGitCmd("merge-base").Arg(refName).Arg(mainBranches...).
+			ToArgv(),
+	).DontLog().RunWithOutput()
+	return ignoringWarnings(output)
+}
+
 func (self *MainBranches) determineMainBranches() []string {
 	var existingBranches []string
 	var wg sync.WaitGroup