diff --git a/sys/dev/firewire/iec68113.h b/sys/dev/firewire/iec68113.h
index ac202fab092e..52a427049b38 100644
--- a/sys/dev/firewire/iec68113.h
+++ b/sys/dev/firewire/iec68113.h
@@ -41,7 +41,7 @@ struct ciphdr {
 	u_int8_t :2,
 		 sph:1,
 		 qpc:3,
-		 fn:1;
+		 fn:2;
 	u_int8_t dbc;
 	u_int8_t fmt:6,
 #define CIP_FMT_DVCR	0