diff --git a/models/notification.go b/models/notification.go
index f31ec6899..8c36c0c5c 100644
--- a/models/notification.go
+++ b/models/notification.go
@@ -120,9 +120,9 @@ func createOrUpdateIssueNotifications(e Engine, issue *Issue, notificationAuthor
 	}
 
 	issue.loadRepo(e)
-	issue.Repo.Units = nil
 
 	for _, watch := range watches {
+		issue.Repo.Units = nil
 		if issue.IsPull && !issue.Repo.CheckUnitUser(watch.UserID, false, UnitTypePullRequests) {
 			continue
 		}