diff --git a/src/gui/opengl/qopenglext.h b/src/gui/opengl/qopenglext.h
index e3f9205619c..8264f9d3572 100644
--- a/src/gui/opengl/qopenglext.h
+++ b/src/gui/opengl/qopenglext.h
@@ -44,7 +44,7 @@ extern "C" {
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN 1
 #endif
-#include <windows.h>
+#include <qt_windows.h>
 #endif
 
 #ifndef APIENTRY
diff --git a/src/testlib/qtestcase.cpp b/src/testlib/qtestcase.cpp
index e1da9e617c1..f25beee4858 100644
--- a/src/testlib/qtestcase.cpp
+++ b/src/testlib/qtestcase.cpp
@@ -102,7 +102,7 @@
 # if !defined(Q_CC_MINGW) || (defined(Q_CC_MINGW) && defined(__MINGW64_VERSION_MAJOR))
 #  include <crtdbg.h>
 # endif
-#include <windows.h> // for Sleep
+#include <qt_windows.h> // for Sleep
 #endif
 #ifdef Q_OS_UNIX
 #include <errno.h>