diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index a2afc94a5408..423fe9b85cb0 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -811,7 +811,7 @@ struct cfg80211_tid_cfg {
 struct cfg80211_tid_config {
 	const u8 *peer;
 	u32 n_tid_conf;
-	struct cfg80211_tid_cfg tid_conf[];
+	struct cfg80211_tid_cfg tid_conf[] __counted_by(n_tid_conf);
 };
 
 /**