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-rw-r--r--lib/sources.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/sources.nix b/lib/sources.nix
index cec395c9bb1..51836696cf1 100644
--- a/lib/sources.nix
+++ b/lib/sources.nix
@@ -175,8 +175,8 @@ let
   */
   commitIdFromGitRepo =
     let readCommitFromFile = file: path:
-        let fileName       = toString path + "/" + file;
-            packedRefsName = toString path + "/packed-refs";
+        let fileName       = path + "/${file}";
+            packedRefsName = path + "/packed-refs";
             absolutePath   = base: path:
               if lib.hasPrefix "/" path
               then path