diff --git a/sdk/include/reactos/wine/strmbase.h b/sdk/include/reactos/wine/strmbase.h
index abe92aea869..1f757401b47 100644
--- a/sdk/include/reactos/wine/strmbase.h
+++ b/sdk/include/reactos/wine/strmbase.h
@@ -19,6 +19,8 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
+#pragma once
+
 #include "wine/list.h"
 
 HRESULT WINAPI CopyMediaType(AM_MEDIA_TYPE * pDest, const AM_MEDIA_TYPE *pSrc);