diff --git a/src/quick/framelessquickapplicationwindow.cpp b/src/quick/framelessquickapplicationwindow.cpp
index a7ef082..6ecf124 100644
--- a/src/quick/framelessquickapplicationwindow.cpp
+++ b/src/quick/framelessquickapplicationwindow.cpp
@@ -29,6 +29,9 @@
 #include "framelessquickhelper.h"
 #include "quickwindowborder.h"
 #include <QtQuick/private/qquickitem_p.h>
+#ifdef Q_OS_WINDOWS
+#  include <framelesshelper_windows.h>
+#endif // Q_OS_WINDOWS
 
 FRAMELESSHELPER_BEGIN_NAMESPACE
 
diff --git a/src/quick/framelessquickwindow.cpp b/src/quick/framelessquickwindow.cpp
index 69ebebb..f1ec45f 100644
--- a/src/quick/framelessquickwindow.cpp
+++ b/src/quick/framelessquickwindow.cpp
@@ -29,6 +29,9 @@
 #include "framelessquickhelper.h"
 #include "quickwindowborder.h"
 #include <QtQuick/private/qquickitem_p.h>
+#ifdef Q_OS_WINDOWS
+#  include <framelesshelper_windows.h>
+#endif // Q_OS_WINDOWS
 
 FRAMELESSHELPER_BEGIN_NAMESPACE