diff --git a/nixos/ringtail/gaming.nix b/nixos/ringtail/gaming.nix
index 2b361b3..d84ef9b 100644
--- a/nixos/ringtail/gaming.nix
+++ b/nixos/ringtail/gaming.nix
@@ -7,6 +7,11 @@
     dedicatedServer.openFirewall = true;
   };
 
+  # Proton Experimental ships an accessibility bridge (xalia) that hangs during
+  # game launch when AT-SPI is not running on the host. This host has no AT-SPI,
+  # so disable xalia globally to avoid wedging iscriptevaluator.exe.
+  environment.sessionVariables.PROTON_USE_XALIA = "0";
+
   # Gamescope — micro-compositor for game fullscreen/resolution management.
   # Use as Steam launch option: gamescope -W 2560 -H 1440 -f -- %command%
   programs.gamescope = {