diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 7fe8207db6ae..2082abdb08d4 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -635,7 +635,8 @@ static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
        [HWSIM_ATTR_SUPPORT_P2P_DEVICE] = { .type = NLA_FLAG },
        [HWSIM_ATTR_USE_CHANCTX] = { .type = NLA_FLAG },
        [HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE] = { .type = NLA_FLAG },
-       [HWSIM_ATTR_RADIO_NAME] = { .type = NLA_STRING },
+       [HWSIM_ATTR_RADIO_NAME] = { .type = NLA_STRING,
+                                   .len = NL80211_WIPHY_NAME_MAXLEN },
        [HWSIM_ATTR_NO_VIF] = { .type = NLA_FLAG },
        [HWSIM_ATTR_FREQ] = { .type = NLA_U32 },
        [HWSIM_ATTR_TX_INFO_FLAGS] = { .type = NLA_BINARY },