diff --git a/src/corelib/io/qsettings_p.h b/src/corelib/io/qsettings_p.h
index f4f285bae47..534c3771028 100644
--- a/src/corelib/io/qsettings_p.h
+++ b/src/corelib/io/qsettings_p.h
@@ -66,7 +66,9 @@
 
 QT_BEGIN_NAMESPACE
 
+#ifndef Q_OS_WIN
 #define QT_QSETTINGS_ALWAYS_CASE_SENSITIVE_AND_FORGET_ORIGINAL_KEY_ORDER
+#endif
 
 // used in testing framework
 #define QSETTINGS_P_H_VERSION 3