diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 4cdb417fd0f9..9153641f7946 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -80,7 +80,7 @@ MODULE_PARM_DESC(storvsc_ringbuffer_size, "Ring buffer size (bytes)");
 /* V1 Beta                    0.1 */
 /* V1 RC < 2008/1/31          1.0 */
 /* V1 RC > 2008/1/31          2.0 */
-#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(2, 0)
+#define VMSTOR_PROTOCOL_VERSION_CURRENT VMSTOR_PROTOCOL_VERSION(4, 2)
 
 
 
@@ -106,7 +106,8 @@ enum vstor_packet_operation {
 	VSTOR_OPERATION_END_INITIALIZATION	= 8,
 	VSTOR_OPERATION_QUERY_PROTOCOL_VERSION	= 9,
 	VSTOR_OPERATION_QUERY_PROPERTIES	= 10,
-	VSTOR_OPERATION_MAXIMUM			= 10
+	VSTOR_OPERATION_ENUMERATE_BUS		= 11,
+	VSTOR_OPERATION_MAXIMUM			= 11
 };
 
 /*