--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -655,6 +655,7 @@ static const struct ieee80211_iface_limi
 				 BIT(NL80211_IFTYPE_AP) },
 	{ .max = 1,	.types = BIT(NL80211_IFTYPE_P2P_CLIENT) |
 				 BIT(NL80211_IFTYPE_P2P_GO) },
+	{ .max = 1,	.types = BIT(NL80211_IFTYPE_ADHOC) },
 };
 
 static const struct ieee80211_iface_limit if_dfs_limits[] = {