diff --git a/pkgs/data/fonts/twitter-color-emoji/default.nix b/pkgs/data/fonts/twitter-color-emoji/default.nix
index 92c01b427e2d..a01b02bdfaf0 100644
--- a/pkgs/data/fonts/twitter-color-emoji/default.nix
+++ b/pkgs/data/fonts/twitter-color-emoji/default.nix
@@ -25,7 +25,7 @@ let
   };
 
   pythonEnv =
-    python3.withPackages (p: [ p.fonttools p.nototools ]);
+    python3.withPackages (ps: with ps; [ fonttools nototools ]);
 
 in
 stdenv.mkDerivation rec {