diff --git a/src/unix/uiactionx11.cpp b/src/unix/uiactionx11.cpp
index f1031d5133..62640b0a3c 100644
--- a/src/unix/uiactionx11.cpp
+++ b/src/unix/uiactionx11.cpp
@@ -153,7 +153,7 @@ protected:
 
         wxWindow* win = wxGetActiveWindow();
 
-    #if defined(__WXGTK__)
+    #if defined(__WXGTK20__)
         if ( win && !win->IsTopLevel() )
         {
             win = wxGetTopLevelParent(win);