diff --git a/default.nix b/default.nix
index 3f43fbb..8262310 100644
--- a/default.nix
+++ b/default.nix
@@ -2,7 +2,7 @@
 let
     inherit (pkgs) callPackage;
     inherit (pkgs.lib) filterAttrs mapAttrs;
-    inherit (builtins) substring readDir;
+    inherit (builtins) substring readDir toString;
 
     here = ./.;
 
@@ -10,5 +10,5 @@ let
         type == "directory" && (substring 0 1 name) != "."
     ) (readDir here);
 in mapAttrs (name: type:
-    callPackage (here/name) {}
+    callPackage ((toString here) + "/" + (toString name)) {}
 ) want