diff --git a/DeviceKit/drv_softi2c.h b/DeviceKit/drv_softi2c.h
index e79b835..4eb553a 100644
--- a/DeviceKit/drv_softi2c.h
+++ b/DeviceKit/drv_softi2c.h
@@ -18,5 +18,6 @@ struct drv_softi2c_t{
 #define drv_softi2c_stop(dev)           drv_device_close(dev)
 #define drv_softi2c_put(dev, data)      ((drv_softi2c_t*)(dev->handle))->put((dev)->handle, (data))
 #define drv_softi2c_get(dev, ack, data) ((drv_softi2c_t*)(dev->handle))->get((dev)->handle, (ack), (data))
+#define drv_softi2c_wait_ack(dev)       ((drv_softi2c_t*)(dev->handle))->wait_ack((dev)->handle)
 
 #endif /*INCLUDED_DRV_SOFTI2C_H*/