diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index 2d2158fbd..1184cd422 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -593,6 +593,7 @@ meta_window_actor_get_shadow_class (MetaWindowActor *self)
       switch (window_type)
         {
         case META_WINDOW_DROPDOWN_MENU:
+        case META_WINDOW_COMBO:
           return "dropdown-menu";
         case META_WINDOW_POPUP_MENU:
           return "popup-menu";