diff --git a/gtk/theme/win32/gtk.css b/gtk/theme/win32/gtk.css
index b9384b7699..218875e589 100644
--- a/gtk/theme/win32/gtk.css
+++ b/gtk/theme/win32/gtk.css
@@ -124,8 +124,8 @@ decoration {
   background-repeat: no-repeat;
 }
 
-/* Unset above settings when the window is a popup menu */
-* window decoration {
+/* Unset above settings when the window is a popup menu or tooltip */
+* window decoration, tooltip decoration {
     all: unset;
 }