diff --git a/sys/net/iso88025.h b/sys/net/iso88025.h
index aad8d54b565..1c38b914aca 100644
--- a/sys/net/iso88025.h
+++ b/sys/net/iso88025.h
@@ -114,9 +114,11 @@ struct iso88025_sockaddr_dl_data {
 	u_short	*trld_route[RIF_MAX_LEN];
 };
 
+#define ISO88025_MIN(a, b)	(((a)<(b))?(a):(b))
 #define SDL_ISO88025(s)		((struct iso88025_sockaddr_dl_data *)	\
-				 ((s)->sdl_data + min((s)->sdl_nlen +	\
-				  (s)->sdl_alen + (s)->sdl_slen, 12)))
+				 ((s)->sdl_data + \
+				  ISO88025_MIN((s)->sdl_nlen + (s)->sdl_alen + \
+					       (s)->sdl_slen, 12)))
 
 /*
  * Structure of a 48-bit iso 802.5 address.