diff --git a/doc/vhost.md b/doc/vhost.md
index f19f7ab5d5c..b2a67f983eb 100644
--- a/doc/vhost.md
+++ b/doc/vhost.md
@@ -231,7 +231,7 @@ EAL:   using IOMMU type 1 (Type 1)
 ~~~
 
 ~~~{.sh}
-host:~# ./scripts/rpc.py bdev_malloc_create 128 4096 Malloc0
+host:~# ./scripts/rpc.py bdev_malloc_create 128 4096 -b Malloc0
 Malloc0
 ~~~