diff --git a/reactos/include/dxsdk/ddraw.h b/reactos/include/dxsdk/ddraw.h
index 0c08da850e1..4b2501410a9 100644
--- a/reactos/include/dxsdk/ddraw.h
+++ b/reactos/include/dxsdk/ddraw.h
@@ -38,8 +38,11 @@
 #endif
 
 #if defined(WINNT) || !defined(WIN32)
+#ifndef _HRESULT_DEFINED
+#define _HRESULT_DEFINED
   typedef long HRESULT;
 #endif
+#endif
 
 #ifdef __cplusplus
 extern "C" {