diff --git a/include/ethernetdb.h b/include/ethernetdb.h
index 46d8bfd..22b6f7f 100644
--- a/include/ethernetdb.h
+++ b/include/ethernetdb.h
@@ -30,6 +30,8 @@
 #define	_PATH_ETHERTYPES	"/etc/ethertypes"
 #endif				/* _PATH_ETHERTYPES */
 
+#define __THROW
+
 struct ethertypeent {
 	char *e_name;		/* Official ethernet type name.  */
 	char **e_aliases;	/* Alias list.  */