diff --git a/examples/external-vault/main.tf b/examples/external-vault/main.tf
index b7f73ed..b3d7c62 100644
--- a/examples/external-vault/main.tf
+++ b/examples/external-vault/main.tf
@@ -106,4 +106,6 @@ module "backup" {
   tags = {
     Environment = "test"
   }
-}
\ No newline at end of file
+
+  depends_on = [aws_backup_vault.external_vault]
+}
diff --git a/main.tf b/main.tf
index b6063d1..2824e54 100644
--- a/main.tf
+++ b/main.tf
@@ -19,7 +19,7 @@ resource "aws_backup_plan" "main" {
     for_each = var.rules
     content {
       rule_name           = lookup(rule.value, "name")
-      target_vault_name   = lookup(rule.value, "target_vault_name", null) == null ? aws_backup_vault.main[0].name : lookup(rule.value, "target_vault_name", "Default")
+      target_vault_name   = lookup(rule.value, "target_vault_name", "Default")
       schedule            = lookup(rule.value, "schedule", null)
       start_window        = lookup(rule.value, "start_window", null)
       completion_window   = lookup(rule.value, "completion_window", null)
@@ -59,6 +59,8 @@ resource "aws_backup_plan" "main" {
   }
 
   tags = var.tags
+
+  depends_on = [aws_backup_vault.main]
 }
 
 #####