diff --git a/src/gtk/window.cpp b/src/gtk/window.cpp
index 79cdcfa490..e979fd123d 100644
--- a/src/gtk/window.cpp
+++ b/src/gtk/window.cpp
@@ -2134,9 +2134,8 @@ void wxWindowGTK::GTKHandleRealized()
     }
 #endif
 
-    const bool isTopLevel = IsTopLevel();
 #if GTK_CHECK_VERSION(3,8,0)
-    if (isTopLevel && gtk_check_version(3,8,0) == NULL)
+    if (IsTopLevel() && gtk_check_version(3,8,0) == NULL)
     {
         GdkFrameClock* clock = gtk_widget_get_frame_clock(m_widget);
         if (clock &&