diff --git a/pkgs/games/steam/chrootenv.nix b/pkgs/games/steam/chrootenv.nix
index 96f409faef87..ff4b104059d7 100644
--- a/pkgs/games/steam/chrootenv.nix
+++ b/pkgs/games/steam/chrootenv.nix
@@ -14,6 +14,7 @@ buildFHSUserEnv {
       pkgs.gnome2.zenity
       pkgs.xdg_utils
       pkgs.xlibs.xrandr
+      pkgs.which
     ]
     ++ lib.optional (config.steam.java or false) pkgs.jdk
     ++ lib.optional (config.steam.primus or false) pkgs.primus