diff --git a/lib/filesystem.nix b/lib/filesystem.nix
index 54b2bea4184fa..753088f7542df 100644
--- a/lib/filesystem.nix
+++ b/lib/filesystem.nix
@@ -367,7 +367,7 @@ in
       inherit (lib.path) append;
       defaultPath = append directory "package.nix";
     in
-    if pathIsRegularFile defaultPath then
+    if pathExists defaultPath then
       # if `${directory}/package.nix` exists, call it directly
       callPackage defaultPath {}
     else lib.concatMapAttrs (name: type: