diff --git a/src/plugins/platforms/windows/qwindowsaccessibility.cpp b/src/plugins/platforms/windows/qwindowsaccessibility.cpp
index 4cc08c7f76..6a66c1f2d9 100644
--- a/src/plugins/platforms/windows/qwindowsaccessibility.cpp
+++ b/src/plugins/platforms/windows/qwindowsaccessibility.cpp
@@ -60,7 +60,7 @@
 #include <QtGui/qplatformnativeinterface_qpa.h>
 #include <QtGui/qwindow.h>
 #include <QtGui/qaccessible2.h>
-#include <OleAcc.h>
+#include <oleacc.h>
 
 //#include <uiautomationcoreapi.h>
 #ifndef UiaRootObjectId
diff --git a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
index 9023769b8b..f48f23b54b 100644
--- a/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
+++ b/src/plugins/platforms/windows/qwindowsdialoghelpers.cpp
@@ -66,8 +66,8 @@
 #include "qtwindows_additional.h"
 
 #define STRICT_TYPED_ITEMIDS
-#include <ShlObj.h>
-#include <Shlwapi.h>
+#include <shlobj.h>
+#include <shlwapi.h>
 
 // #define USE_NATIVE_COLOR_DIALOG /* Testing purposes only */
 
diff --git a/src/plugins/platforms/windows/qwindowsglcontext.cpp b/src/plugins/platforms/windows/qwindowsglcontext.cpp
index 1866faecd1..c3e793b61e 100644
--- a/src/plugins/platforms/windows/qwindowsglcontext.cpp
+++ b/src/plugins/platforms/windows/qwindowsglcontext.cpp
@@ -48,8 +48,8 @@
 #include <QtGui/QGuiApplication>
 #include <QtGui/QPlatformNativeInterface>
 
-#include <WinGDI.h>
-#include <GL/Gl.h>
+#include <wingdi.h>
+#include <GL/gl.h>
 
 // #define DEBUG_GL