diff --git a/libavcodec/dxva2.h b/libavcodec/dxva2.h
index 78939be961..d9017c6b8d 100644
--- a/libavcodec/dxva2.h
+++ b/libavcodec/dxva2.h
@@ -29,7 +29,11 @@
  * Public libavcodec DXVA2 header.
  */
 
+#if !defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0600
+#undef _WIN32_WINNT
 #define _WIN32_WINNT 0x0600
+#endif
+
 #include <stdint.h>
 #include <d3d9.h>
 #include <dxva2api.h>
diff --git a/libavcodec/dxva2_internal.h b/libavcodec/dxva2_internal.h
index f35a0765ce..b775e6c304 100644
--- a/libavcodec/dxva2_internal.h
+++ b/libavcodec/dxva2_internal.h
@@ -23,7 +23,6 @@
 #ifndef AVCODEC_DXVA_INTERNAL_H
 #define AVCODEC_DXVA_INTERNAL_H
 
-#define _WIN32_WINNT 0x0600
 #define COBJMACROS
 
 #include "config.h"