diff --git a/src/gtk/toplevel.cpp b/src/gtk/toplevel.cpp
index 85a6a3b755..42ca6f1ca0 100644
--- a/src/gtk/toplevel.cpp
+++ b/src/gtk/toplevel.cpp
@@ -1359,6 +1359,9 @@ void wxTopLevelWindowGTK::GTKUpdateDecorSize(const DecorSize& decorSize)
 #ifdef __WXGTK3__
         GTKSizeRevalidate();
 #endif
+        if (!m_isShown)
+            return;
+
         gtk_widget_show(m_widget);
 
 #ifdef __WXGTK3__