diff --git a/sys/net80211/ieee80211_scan_sw.c b/sys/net80211/ieee80211_scan_sw.c
index ac97b7c14cbc..0aaa80a6c48d 100644
--- a/sys/net80211/ieee80211_scan_sw.c
+++ b/sys/net80211/ieee80211_scan_sw.c
@@ -674,7 +674,7 @@ scan_start(void *arg, int pending)
 }
 
 static void
-scan_curchan_task(void *arg, int pending)
+scan_curchan_task(void *arg, int pending __unused)
 {
 	struct ieee80211_scan_state *ss = arg;
 	struct scan_state *ss_priv = SCAN_PRIVATE(ss);