diff --git a/nixos/default.nix b/nixos/default.nix
index 9995dfc..584a2bb 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -6,7 +6,7 @@ self: {
 }: let
   phps = let
     packages = self.packages.${pkgs.system};
-    filter = name: _: builtins.match "^php[[:digit:]]*$" name;
+    filter = name: _: (builtins.match "^php[[:digit:]]*$" name) != null;
   in
     lib.filterAttrs filter packages;
   cfg = config.programs.phps;