diff --git a/src/corelib/plugin/quuid.cpp b/src/corelib/plugin/quuid.cpp
index 812e2c9fb6..8b6dfc6932 100644
--- a/src/corelib/plugin/quuid.cpp
+++ b/src/corelib/plugin/quuid.cpp
@@ -891,7 +891,7 @@ bool QUuid::operator>(const QUuid &other) const Q_DECL_NOTHROW
 
     \sa variant(), version()
 */
-#if defined(Q_OS_WIN32)
+#if defined(Q_OS_WIN)
 
 QT_BEGIN_INCLUDE_NAMESPACE
 #include <objbase.h> // For CoCreateGuid
@@ -905,7 +905,7 @@ QUuid QUuid::createUuid()
     return result;
 }
 
-#else // !Q_OS_WIN32
+#else // Q_OS_WIN
 
 QT_BEGIN_INCLUDE_NAMESPACE
 #include "qdatetime.h"
@@ -989,7 +989,7 @@ QUuid QUuid::createUuid()
 
     return result;
 }
-#endif // !Q_OS_WIN32
+#endif // !Q_OS_WIN
 
 /*!
     \fn bool QUuid::operator==(const GUID &guid) const