diff --git a/include/ifdef.h b/include/ifdef.h
index 80ab75541f1..bdda8a20df8 100644
--- a/include/ifdef.h
+++ b/include/ifdef.h
@@ -18,6 +18,8 @@
 #ifndef WINE_IFDEF_H
 #define WINE_IFDEF_H
 
+#include <ipifcons.h>
+
 typedef ULONG32 NET_IF_OBJECT_ID, *PNET_IF_OBJECT_ID;
 typedef UINT32 NET_IF_COMPARTMENT_ID, *PNET_IF_COMPARTMENT_ID;
 typedef GUID NET_IF_NETWORK_GUID, *PNET_IF_NETWORK_GUID;