diff --git a/rds-postgres/main.tf b/rds-postgres/main.tf
index 1e8a814..a247239 100644
--- a/rds-postgres/main.tf
+++ b/rds-postgres/main.tf
@@ -113,7 +113,7 @@ resource "aws_security_group" "this_security_group" {
   # ingress self (list with one or zero items)
   dynamic "ingress" {
     for_each = var.enable_self ? local.port_map["external"] : toset([])
-    iterator = sg
+    iterator = p
     content {
       description = "${local.short_description}: ${p.value["description"]}"
       from_port   = p.value["from"]