diff --git a/modules/self-managed-node-group/main.tf b/modules/self-managed-node-group/main.tf
index 52600fa..3958fad 100644
--- a/modules/self-managed-node-group/main.tf
+++ b/modules/self-managed-node-group/main.tf
@@ -44,7 +44,8 @@ locals {
 }
 
 data "aws_ssm_parameter" "ami" {
-  count = var.create ? 1 : 0
+  # only pull the ami if we're creating the resource AND we're not already using a custom ami
+  count = var.create && var.ami_id == "" ? 1 : 0
 
   region = var.region
 
@@ -221,7 +222,7 @@ resource "aws_launch_template" "this" {
     arn = var.create_iam_instance_profile ? aws_iam_instance_profile.this[0].arn : var.iam_instance_profile_arn
   }
 
-  image_id                             = coalesce(var.ami_id, nonsensitive(data.aws_ssm_parameter.ami[0].value))
+  image_id                             = var.ami_id == "" ? nonsensitive(data.aws_ssm_parameter.ami[0].value) : var.ami_id
   instance_initiated_shutdown_behavior = var.instance_initiated_shutdown_behavior
 
   dynamic "instance_market_options" {