diff --git a/modules/sway.nix b/modules/sway.nix
index e26bf8c..37628c3 100644
--- a/modules/sway.nix
+++ b/modules/sway.nix
@@ -71,11 +71,14 @@
       # Make pipewire present a pulse audio tcp port
       pactl load-module module-native-protocol-tcp
       # Make firefox use wayland
-      export MOZ_ENABLE_WAYLAND=1
       export XDG_CURRENT_DESKTOP="sway"
     '';
   };
 
+  environment.sessionVariables = {
+    MOZ_ENABLE_WAYLAND = "1";
+  };
+
   # Enable the xdg-portal
   xdg = {
     portal = {