diff --git a/qtinterface/tqt.h.cmake b/qtinterface/tqt.h.cmake
index 6d0ee4e..8a7bf67 100644
--- a/qtinterface/tqt.h.cmake
+++ b/qtinterface/tqt.h.cmake
@@ -28,10 +28,6 @@ Boston, MA 02110-1301, USA.
 #define TQT_NO_SQL
 #endif /* QT_NO_SQL */
 
-#ifdef Q_WS_X11
-#define TQ_WS_X11
-#endif /* Q_WS_X11 */
-
 #define Qt TQt
 
 #define tqmoc	moc