diff --git a/sys/netgraph/bluetooth/socket/ng_btsocket_hci_raw.c b/sys/netgraph/bluetooth/socket/ng_btsocket_hci_raw.c
--- a/sys/netgraph/bluetooth/socket/ng_btsocket_hci_raw.c
+++ b/sys/netgraph/bluetooth/socket/ng_btsocket_hci_raw.c
@@ -808,8 +808,7 @@
 
 	/* Enable all events */
 	memset(&ng_btsocket_hci_raw_sec_filter->events, 0xff,
-		sizeof(ng_btsocket_hci_raw_sec_filter->events)/
-			sizeof(ng_btsocket_hci_raw_sec_filter->events[0]));
+		sizeof(ng_btsocket_hci_raw_sec_filter->events));
 
 	/* Disable some critical events */
 	f = ng_btsocket_hci_raw_sec_filter->events;