diff --git a/sys/netgraph/bluetooth/include/ng_hci.h b/sys/netgraph/bluetooth/include/ng_hci.h
--- a/sys/netgraph/bluetooth/include/ng_hci.h
+++ b/sys/netgraph/bluetooth/include/ng_hci.h
@@ -448,7 +448,8 @@
 typedef bdaddr_t *	bdaddr_p;
 
 /* Any BD_ADDR. Note: This is actually 7 bytes (count '\0' terminator) */
-#define NG_HCI_BDADDR_ANY	((bdaddr_p) "\000\000\000\000\000\000")
+#define NG_HCI_BDADDR_ANY	\
+	((bdaddr_p) __DECONST(char *, "\000\000\000\000\000\000"))
 
 /* HCI status return parameter */
 typedef struct {