diff --git a/gtk/theme/win32/gtk.css b/gtk/theme/win32/gtk.css
index dd0f2547a2..b9384b7699 100644
--- a/gtk/theme/win32/gtk.css
+++ b/gtk/theme/win32/gtk.css
@@ -123,6 +123,12 @@ decoration {
   background-position: top, bottom, left, right;
   background-repeat: no-repeat;
 }
+
+/* Unset above settings when the window is a popup menu */
+* window decoration {
+    all: unset;
+}
+
 .titlebar { 
   margin: calc(0px - -gtk-win32-size(window, cyframe) - -gtk-win32-size(window, cxpaddedborder))
           calc(0px - -gtk-win32-size(window, cxframe) - -gtk-win32-size(window, cxpaddedborder));