diff --git a/FreeBSD/vm/vcreate.csh b/FreeBSD/vm/vcreate.csh
index 8ddd98f..b95c31c 100644
--- a/FreeBSD/vm/vcreate.csh
+++ b/FreeBSD/vm/vcreate.csh
@@ -16,6 +16,7 @@ set IMAGE=ubuntu20.img
 set PUBKEY=/home/simon/.ssh/id_ed25519.pub
 set NAMESERVER=192.168.10.254
 set GATEWAY=192.168.10.254
+set PREFIX=24
 
 # create vm
 $VM create \
@@ -23,5 +24,5 @@ $VM create \
   -s $SIZE \
   -i $IMAGE \
   -C -k $PUBKEY \
-  -n "ip=$IP/24;gateway=$GATEWAY;nameservers=$NAMESERVER" \
+  -n "ip=$IP/$PREFIX;gateway=$GATEWAY;nameservers=$NAMESERVER" \
   $HOSTNAME