diff --git a/flake.nix b/flake.nix
index e31f50f..da251c9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,7 +13,7 @@
         inherit (pkgs) lib;
 
         # Check if project has a shell.nix
-        hasShell = dir: (builtins.readDir ./${dir}) ? "shell.nix";
+        hasShell = dir: builtins.pathExists ./${dir}/shell.nix;
 
         # Get all project directories
         currentDir = builtins.readDir ./.;