diff --git a/sys/dev/rtwn/rtl8192c/r92c_fw_cmd.h b/sys/dev/rtwn/rtl8192c/r92c_fw_cmd.h
--- a/sys/dev/rtwn/rtl8192c/r92c_fw_cmd.h
+++ b/sys/dev/rtwn/rtl8192c/r92c_fw_cmd.h
@@ -80,6 +80,7 @@
 	uint32_t	mask;
 	uint8_t		macid;
 #define R92C_CMD_MACID_VALID	0x80
+#define R92C_CMD_MACID_SGI	0x20
 } __packed;
 
 /*