diff --git a/dlls/wsock32/wscontrol.h b/dlls/wsock32/wscontrol.h
index 41427018819..8e80e641f87 100644
--- a/dlls/wsock32/wscontrol.h
+++ b/dlls/wsock32/wscontrol.h
@@ -119,9 +119,13 @@ typedef struct IPAddrEntry
    ushort         iae_pad;
 } IPAddrEntry;
 
-#ifdef __NetBSD__
+#ifdef if_type
 #undef if_type
+#endif
+#ifdef if_mtu
 #undef if_mtu
+#endif
+#ifdef if_lastchange
 #undef if_lastchange
 #endif