diff --git a/phone/configuration.nix b/phone/configuration.nix
index 0e35959e..f0ad0f3d 100644
--- a/phone/configuration.nix
+++ b/phone/configuration.nix
@@ -6,7 +6,7 @@ in
 {
   environment = {
     sessionVariables = {
-      LIBGL_ALWAYS_SOFTWARE = true;
+      LIBGL_ALWAYS_SOFTWARE = "true";
     };
 
     shells = with pkgs; [