diff --git a/pkgs/games/steam/chrootenv.nix b/pkgs/games/steam/chrootenv.nix
index 4de5f6608186..2762155d63ce 100644
--- a/pkgs/games/steam/chrootenv.nix
+++ b/pkgs/games/steam/chrootenv.nix
@@ -23,6 +23,8 @@ let
       # Open URLs
       xdg_utils
       iana-etc
+      # Steam Play / Proton
+      python3
     ] ++ lib.optional withJava jdk
       ++ lib.optional withPrimus primus
       ++ extraPkgs pkgs;