diff --git a/lib/repoSource.nix b/lib/repoSource.nix
index 6bb7b1350..7fd611300 100644
--- a/lib/repoSource.nix
+++ b/lib/repoSource.nix
@@ -21,7 +21,7 @@ let
   localPath = ../repos + "/${name}";
 in
   if lib.pathExists localPath then
-    localPath
+    "${localPath}"
   else if lib.hasPrefix "https://github.com" attr.url && !submodules then
     fetchzip {
       url = "${attr.url}/archive/${revision.rev}.zip";