diff --git a/src/locationlabs/qlocationlabsglobal_p.h b/src/locationlabs/qlocationlabsglobal_p.h
index aa9658646c0e2921d53e2e33a0418a67bdb918fe..6dc292968dad278028e343d482a2d9b42b3088ad 100644
--- a/src/locationlabs/qlocationlabsglobal_p.h
+++ b/src/locationlabs/qlocationlabsglobal_p.h
@@ -36,6 +36,17 @@
 #ifndef QLOCATIONLABSGLOBAL_P_H
 #define QLOCATIONLABSGLOBAL_P_H
 
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
 #include <QtCore/qglobal.h>
 
 QT_BEGIN_NAMESPACE