diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 56d729c43b31..4b4d3c8a1aed 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -57,7 +57,7 @@ static int get_drv_dev_by_info_ifindex(struct nlattr **attrs,
 static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
 	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
 	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
-				      .len = BUS_ID_SIZE-1 },
+				      .len = 20-1 },
 	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
 	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
 	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },