diff --git a/services/context/repo.go b/services/context/repo.go
index 1084f5ce9c..a710a3f80f 100644
--- a/services/context/repo.go
+++ b/services/context/repo.go
@@ -455,7 +455,7 @@ func repoAssignmentLegacy(ctx *Context, data *repoAssignmentPrepareDataStruct) {
 				return
 			}
 		} else {
-			ctx.NotFound(nil)
+			ctx.HTTPError(http.StatusForbidden, "You do not have permission to access this repository")
 			return
 		}
 	}