diff --git a/pr-review/main.go b/pr-review/main.go
index 912afe1..be49412 100644
--- a/pr-review/main.go
+++ b/pr-review/main.go
@@ -63,11 +63,12 @@ func processPullRequestSync(h *common.RequestHandler) error {
 	}
 
 	// nothing changed, still in sync
-	if commitId == req.Pull_Request.Head.Ref {
+	if commitId == req.Pull_Request.Head.Sha {
+		h.Log("commitID already match - nothing to do")
 		return nil
 	}
 
-	h.Log("different ids: '%s' vs. '%s'", req.Pull_Request.Head.Ref, commitId)
+	h.Log("different ids: '%s' vs. '%s'", req.Pull_Request.Head.Sha, commitId)
 
 	commitMsg := fmt.Sprintf(`Sync PR