diff --git a/hosts/nb-new.cloonar.com/users/dominik.nix b/hosts/nb-new.cloonar.com/users/dominik.nix
index ac5421f..aea645d 100644
--- a/hosts/nb-new.cloonar.com/users/dominik.nix
+++ b/hosts/nb-new.cloonar.com/users/dominik.nix
@@ -109,9 +109,9 @@ in
 
     gtk = {
       enable = true;
-      gtk2.extraConfig = {
-        "gtk-application-prefer-dark-theme" = true;
-      };
+      gtk2.extraConfig = ''
+        gtk-application-prefer-dark-theme=1;
+      '';
       gtk3.extraConfig = {
         "gtk-application-prefer-dark-theme" = true;
       };