diff --git a/lib/git-source/default.nix b/lib/git-source/default.nix
index d9b68b7..6117a4e 100644
--- a/lib/git-source/default.nix
+++ b/lib/git-source/default.nix
@@ -11,4 +11,4 @@ let
       fs.intersection sourceFiles subdir;
   finalRoot = if subdir == null then root else subdir;
 in
-  fs.toSource { root = finalRoot; fileset = sourceFiles; }
+  fs.toSource { root = finalRoot; fileset = finalSourceFiles; }