diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index 11c68b159324..c34a09adf2db 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -2380,7 +2380,7 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
 		capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
 	}
 
-	ies = kzalloc(sizeof(*ies) + ielen, gfp);
+	ies = kzalloc(struct_size(ies, data, ielen), gfp);
 	if (!ies)
 		return NULL;
 	ies->len = ielen;