diff --git a/modules/qt/nixos.nix b/modules/qt/nixos.nix
index f596f114..f05456b6 100644
--- a/modules/qt/nixos.nix
+++ b/modules/qt/nixos.nix
@@ -24,6 +24,7 @@ in
         Defaults to the standard platform used in the configured DE.
       '';
       type = lib.types.str;
+      default = "qtct";
     };
   };