diff --git a/simple_vm/main.tf b/simple_vm/main.tf
index 0d5875b..88798db 100644
--- a/simple_vm/main.tf
+++ b/simple_vm/main.tf
@@ -1,5 +1,6 @@
 resource "openstack_networking_secgroup_v2" "main-sg" {
-  name = var.name
+  name                 = var.name
+  delete_default_rules = true
 }
 
 resource "openstack_networking_secgroup_rule_v2" "ipv4-egress" {