diff --git a/hw/vhost.c b/hw/vhost.c
index 541c7163b26cfec7e0da0676e45578eca70ea92a..d924fb0e4df6368fc8d2354c81d47d5494d618cc 100644
--- a/hw/vhost.c
+++ b/hw/vhost.c
@@ -456,7 +456,7 @@ static void vhost_region_del(MemoryListener *listener,
             == section->offset_within_address_space) {
             --dev->n_mem_sections;
             memmove(&dev->mem_sections[i], &dev->mem_sections[i+1],
-                    dev->n_mem_sections - i);
+                    (dev->n_mem_sections - i) * sizeof(*dev->mem_sections));
             break;
         }
     }