diff --git a/src/processingdialog.cpp b/src/processingdialog.cpp
index 8280920..31b7630 100644
--- a/src/processingdialog.cpp
+++ b/src/processingdialog.cpp
@@ -35,7 +35,7 @@
 #include <tqstyle.h>
 #include <tqimage.h>
 
-#ifdef Q_WS_X11
+#ifdef TQ_WS_X11
 #include <netwm.h>
 #endif