diff --git a/src/gtk/toplevel.cpp b/src/gtk/toplevel.cpp
index 53d59d6088..5c173ab8dd 100644
--- a/src/gtk/toplevel.cpp
+++ b/src/gtk/toplevel.cpp
@@ -1145,12 +1145,8 @@ void wxTopLevelWindowGTK::DoSetSize( int x, int y, int width, int height, int si
 extern "C" {
 static gboolean reset_size_request(void* data)
 {
-    if ( GTK_IS_WIDGET(data) )
-    {
-        gtk_widget_set_size_request(GTK_WIDGET(data), -1, -1);
-    }
-    //else: the window has probably been deleted before the idle callback was
-    //      invoked
+    gtk_widget_set_size_request(GTK_WIDGET(data), -1, -1);
+    g_object_unref(data);
     return false;
 }
 }
@@ -1179,7 +1175,8 @@ void wxTopLevelWindowGTK::DoSetClientSize(int width, int height)
         {
             gtk_widget_set_size_request(m_wxwindow, m_clientWidth, m_clientHeight);
             // Cancel size request at next idle to allow resizing
-            g_idle_add_full(G_PRIORITY_LOW, reset_size_request, m_wxwindow, NULL);
+            g_idle_add_full(G_PRIORITY_LOW - 1, reset_size_request, m_wxwindow, NULL);
+            g_object_ref(m_wxwindow);
         }
     }
 }