diff --git a/routers/web/repo/pull.go b/routers/web/repo/pull.go
index 6e8f575ad5..080eb04148 100644
--- a/routers/web/repo/pull.go
+++ b/routers/web/repo/pull.go
@@ -510,6 +510,8 @@ func PrepareViewPullInfo(ctx *context.Context, issue *issues_model.Issue) *git.C
 			return nil
 		}
 		ctx.Data["GetCommitMessages"] = pull_service.GetSquashMergeCommitMessages(ctx, pull)
+	} else {
+		ctx.Data["GetCommitMessages"] = ""
 	}
 
 	sha, err := baseGitRepo.GetRefCommitID(pull.GetGitRefName())
diff --git a/templates/repo/issue/view_content/pull.tmpl b/templates/repo/issue/view_content/pull.tmpl
index 0d92393cb2..e1766e78e5 100644
--- a/templates/repo/issue/view_content/pull.tmpl
+++ b/templates/repo/issue/view_content/pull.tmpl
@@ -396,7 +396,7 @@
 										'allowed': {{$prUnit.PullRequestsConfig.AllowSquash}},
 										'textDoMerge': {{$.i18n.Tr "repo.pulls.squash_merge_pull_request"}},
 										'mergeTitleFieldText': defaultSquashMergeTitle,
-										'mergeMessageFieldText': defaultMergeMessage,
+										'mergeMessageFieldText': {{.GetCommitMessages}} + defaultMergeMessage,
 										'hideAutoMerge': generalHideAutoMerge,
 									},
 									{