diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index dc1123a..72eddd1 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -3567,8 +3567,9 @@
 			return i;
 
 	/* warn when we cannot find a rate. */
-	WARN_ON(1);
+	WARN_ON_ONCE(1);
 
+	/* and return 0 (the lowest index) */
 	return 0;
 }