diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp
index 82257259a84..a9daedc70f3 100644
--- a/src/corelib/global/qlogging.cpp
+++ b/src/corelib/global/qlogging.cpp
@@ -374,7 +374,6 @@ static void qt_message(QtMsgType msgType, const QMessageLogContext &context, con
         qt_message_fatal(msgType, context, buf);
 }
 
-#undef qDebug
 /*!
     Logs a debug message specified with format \a msg. Additional
     parameters, specified by \a msg, may be used.
@@ -389,8 +388,6 @@ void QMessageLogger::debug(const char *msg, ...) const
     va_end(ap);
 }
 
-
-#undef qInfo
 /*!
     Logs an informational message specified with format \a msg. Additional
     parameters, specified by \a msg, may be used.
@@ -619,7 +616,6 @@ QDebug QMessageLogger::info(QMessageLogger::CategoryFunction catFunc) const
 
 #endif
 
-#undef qWarning
 /*!
     Logs a warning message specified with format \a msg. Additional
     parameters, specified by \a msg, may be used.
@@ -725,8 +721,6 @@ QDebug QMessageLogger::warning(QMessageLogger::CategoryFunction catFunc) const
 
 #endif
 
-#undef qCritical
-
 /*!
     Logs a critical message specified with format \a msg. Additional
     parameters, specified by \a msg, may be used.
@@ -833,8 +827,6 @@ QDebug QMessageLogger::critical(QMessageLogger::CategoryFunction catFunc) const
 
 #endif
 
-#undef qFatal
-
 /*!
     Logs a fatal message specified with format \a msg for the context \a cat.
     Additional parameters, specified by \a msg, may be used.
diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index ad967398fb5..d87874261ca 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -2,13 +2,6 @@
 // Copyright (C) 2016 Intel Corporation.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#ifdef QT_NO_DEBUG
-#undef QT_NO_DEBUG
-#endif
-#ifdef qDebug
-#undef qDebug
-#endif
-
 #include "qdebug.h"
 #include "private/qdebug_p.h"
 #include "qmetaobject.h"