diff --git a/sys/dev/iicbus/iic.h b/sys/dev/iicbus/iic.h
index bc29fa01518..bc2c81e2949 100644
--- a/sys/dev/iicbus/iic.h
+++ b/sys/dev/iicbus/iic.h
@@ -38,6 +38,8 @@ struct iic_msg
 	uint16_t	flags;
 #define	IIC_M_WR	0	/* Fake flag for write */
 #define	IIC_M_RD	0x0001	/* read vs write */
+#define	IIC_M_NOSTOP	0x0002	/* do not send a I2C stop after message */
+#define	IIC_M_NOSTART	0x0004	/* do not send a I2C start before message */
 	uint16_t	len;	/* msg legnth */
 	uint8_t *	buf;
 };