diff --git a/drivers/block/sunvdc.c b/drivers/block/sunvdc.c
index 564156a8e57251f68181a706f959f5b5299bfdf5..5814deb6963d52a875708e78a4a3a38eb148145e 100644
--- a/drivers/block/sunvdc.c
+++ b/drivers/block/sunvdc.c
@@ -461,7 +461,7 @@ static int generic_request(struct vdc_port *port, u8 op, void *buf, int len)
 	int op_len, err;
 	void *req_buf;
 
-	if (!(((u64)1 << ((u64)op - 1)) & port->operations))
+	if (!(((u64)1 << (u64)op) & port->operations))
 		return -EOPNOTSUPP;
 
 	switch (op) {