diff --git a/mingw-w64-headers/include/ras.h b/mingw-w64-headers/include/ras.h
index e47c18c..b698b44 100644
--- a/mingw-w64-headers/include/ras.h
+++ b/mingw-w64-headers/include/ras.h
@@ -135,6 +135,9 @@
     WCHAR szDomain[DNLEN + 1 ];
     DWORD dwSubEntry;
     ULONG_PTR dwCallbackId;
+#if _WIN32_WINNT >= 0x0601
+    DWORD dwIfIndex;
+#endif
   };
 
 #define RASDIALPARAMSA struct tagRASDIALPARAMSA
@@ -148,6 +151,9 @@
     CHAR szDomain[DNLEN + 1 ];
     DWORD dwSubEntry;
     ULONG_PTR dwCallbackId;
+#if _WIN32_WINNT >= 0x0601
+    DWORD dwIfIndex;
+#endif
   };
 
 #define RASDIALPARAMS __MINGW_NAME_AW(RASDIALPARAMS)