diff --git a/outputs.nix b/outputs.nix
index 48ad9b6..b26e229 100644
--- a/outputs.nix
+++ b/outputs.nix
@@ -1,7 +1,7 @@
 {
   inputsPath ? ./inputs.nix,
   inputs ? import inputsPath {},
-  selfPath ? ./.
+  selfPath ? builtins.toString ./.,
 }:
 
 let