diff --git a/drivers/staging/hv/storvsc_api.h b/drivers/staging/hv/storvsc_api.h
index 99d878a19f1ca10a5516afe4b809f8ffe67eba55..fac607ca228e2b34aef7eea9c31e7096bc81bc39 100644
--- a/drivers/staging/hv/storvsc_api.h
+++ b/drivers/staging/hv/storvsc_api.h
@@ -82,6 +82,7 @@ struct storvsc_driver {
 };
 
 struct storvsc_device_info {
+	u32 ring_buffer_size;
 	unsigned int port_number;
 	unsigned char path_id;
 	unsigned char target_id;