diff --git a/sys/dev/iwn/if_iwn.c b/sys/dev/iwn/if_iwn.c
index 02185d49db7b..7a59796dfbe0 100644
--- a/sys/dev/iwn/if_iwn.c
+++ b/sys/dev/iwn/if_iwn.c
@@ -2005,8 +2005,6 @@ iwn_setregdomain(struct ieee80211com *ic, struct ieee80211_regdomain *rd,
 	return 0;
 }
 
-#define nitems(_a)	(sizeof((_a)) / sizeof((_a)[0]))
-
 static void
 iwn_read_eeprom_enhinfo(struct iwn_softc *sc)
 {