diff --git a/models/issues/issue_label.go b/models/issues/issue_label.go
index 10fc821454..f082079e07 100644
--- a/models/issues/issue_label.go
+++ b/models/issues/issue_label.go
@@ -206,6 +206,7 @@ func DeleteIssueLabel(ctx context.Context, issue *Issue, label *Label, doer *use
 	}
 
 	issue.Labels = nil
+	issue.isLabelsLoaded = false
 	return issue.LoadLabels(ctx)
 }