1 files changed, 8 insertions, 2 deletions

diff --git a/services/pull/merge.go b/services/pull/merge.go
index a20a214014..47521ce147 100644
--- a/services/pull/merge.go
+++ b/services/pull/merge.go
@@ -574,16 +574,22 @@ func CheckPRReadyToMerge(pr *models.PullRequest) (err error) {
 		}
 	}
 
-	if enoughApprovals := pr.ProtectedBranch.HasEnoughApprovals(pr); !enoughApprovals {
+	if !pr.ProtectedBranch.HasEnoughApprovals(pr) {
 		return models.ErrNotAllowedToMerge{
 			Reason: "Does not have enough approvals",
 		}
 	}
-	if rejected := pr.ProtectedBranch.MergeBlockedByRejectedReview(pr); rejected {
+	if pr.ProtectedBranch.MergeBlockedByRejectedReview(pr) {
 		return models.ErrNotAllowedToMerge{
 			Reason: "There are requested changes",
 		}
 	}
 
+	if pr.ProtectedBranch.MergeBlockedByOutdatedBranch(pr) {
+		return models.ErrNotAllowedToMerge{
+			Reason: "The head branch is behind the base branch",
+		}
+	}
+
 	return nil
 }