diff --git a/vdi_create.sh b/vdi_create.sh
index 8f930b8..e02c658 100755
--- a/vdi_create.sh
+++ b/vdi_create.sh
@@ -58,6 +58,7 @@ do
     VBoxManage modifyvm ${VAR_NAME}-${N} \
 	    --ioapic on \
 	    --memory ${VAR_MEM} \
+	    --cpus=${VAR_CPU} \
 	    --vram ${VAR_VID} \
 	    --nic1 Nat \
         --graphicscontroller vmsvga \