diff --git a/mkspecs/dilos-g++/qplatformdefs.h b/mkspecs/dilos-g++/qplatformdefs.h
index c27f28d7..fe898438 100644
--- a/mkspecs/dilos-g++/qplatformdefs.h
+++ b/mkspecs/dilos-g++/qplatformdefs.h
@@ -16,7 +16,7 @@
 // We are hot - unistd.h should have turned on the specific APIs we requested
 
 
-#ifdef TQT_THREAD_SUPPORT
+#ifdef QT_THREAD_SUPPORT
 #include <pthread.h>
 #endif