diff --git a/src/corelib/thread/qthread_unix.cpp b/src/corelib/thread/qthread_unix.cpp
index 6248842d78d..9ad32b162dd 100644
--- a/src/corelib/thread/qthread_unix.cpp
+++ b/src/corelib/thread/qthread_unix.cpp
@@ -83,19 +83,6 @@
 #include <sys/pstat.h>
 #endif
 
-#if defined(Q_OS_MAC)
-# ifdef qDebug
-#   define old_qDebug qDebug
-#   undef qDebug
-# endif
-
-# ifdef old_qDebug
-#   undef qDebug
-#   define qDebug QT_NO_QDEBUG_MACRO
-#   undef old_qDebug
-# endif
-#endif
-
 #if defined(Q_OS_LINUX) && !defined(QT_LINUXBASE)
 #include <sys/prctl.h>
 #endif