Index: winetests/iphlpapi/iphlpapi.c
===================================================================
--- winetests/iphlpapi/iphlpapi.c	(revision 70267)
+++ winetests/iphlpapi/iphlpapi.c	(working copy)
@@ -53,10 +53,13 @@
 #undef ntohl
 #undef ntohs
 
-#define htonl(l) ((u_long)(l))
-#define htons(s) ((u_short)(s))
-#define ntohl(l) ((u_long)(l))
-#define ntohs(s) ((u_short)(s))
+#define htons(x) ((((x) & 0xff) << 8) | (((x) & 0xff00) >> 8))
+#define ntohs(x) htons(x)
+#define htonl(x) ((((x) & 0xff) << 24) | \
+                  (((x) & 0xff00) << 8) | \
+                  (((x) & 0xff0000UL) >> 8) | \
+                  (((x) & 0xff000000UL) >> 24))
+#define ntohl(x) htonl(x)
 
 static HMODULE hLibrary = NULL;