diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index d2cdff6..a4a8ddc 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -51,7 +51,7 @@ jobs:
     name: Minimum version check
     runs-on: ubuntu-latest
     container:
-      image: hashicorp/terraform:0.12.0
+      image: hashicorp/terraform:0.12.20
     steps:
       - uses: actions/checkout@master
       - name: Validate Code
diff --git a/README.md b/README.md
index 6ae826d..ef62723 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ If you have specified cloudfront_default_certificate, TLSv1 must be specified.
 
 | Name | Version |
 |------|---------|
-| terraform | >= 0.12.0 |
+| terraform | >= 0.12.20 |
 
 ## Providers
 
@@ -52,6 +52,7 @@ If you have specified cloudfront_default_certificate, TLSv1 must be specified.
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
 | alarm\_cloudfront\_500\_errors\_threshold | Cloudfront 500 Errors rate threshold (use 0 to disable this alarm) | `number` | `5` | no |
+| alarm\_prefix | String prefix for cloudwatch alarms. (Optional) | `string` | `"alarm"` | no |
 | alarm\_sns\_topics\_us | Alarm topics to create and alert on metrics on US region | `list` | `[]` | no |
 | alb\_cloudfront\_key | Key generated by terraform-aws-ecs module to allow ALB connection from CloudFront | `any` | n/a | yes |
 | alb\_dns\_name | ALB DNS Name that CloudFront will point as origin | `any` | n/a | yes |
diff --git a/_data.tf b/_data.tf
index 239bc19..baf38e6 100644
--- a/_data.tf
+++ b/_data.tf
@@ -1 +1,3 @@
-data "aws_iam_account_alias" "current" {}
+data "aws_iam_account_alias" "current" {
+  count = var.alarm_prefix == "" ? 1 : 0
+}
diff --git a/_variables.tf b/_variables.tf
index 02da8e7..82b32e2 100644
--- a/_variables.tf
+++ b/_variables.tf
@@ -116,3 +116,9 @@ variable "dynamic_ordered_cache_behavior" {
   type        = any
   default     = []
 }
+
+variable "alarm_prefix" {
+  type        = string
+  description = "String prefix for cloudwatch alarms. (Optional)"
+  default     = "alarm"
+}
\ No newline at end of file
diff --git a/cloudwatch-alarms.tf b/cloudwatch-alarms.tf
index aae3c81..33fb3f4 100644
--- a/cloudwatch-alarms.tf
+++ b/cloudwatch-alarms.tf
@@ -2,7 +2,7 @@ resource "aws_cloudwatch_metric_alarm" "cloudfront_500_errors" {
   provider = aws.us-east-1
   count    = length(var.alarm_sns_topics_us) > 0 && var.alarm_cloudfront_500_errors_threshold != 0 ? 1 : 0
 
-  alarm_name                = "${data.aws_iam_account_alias.current.account_alias}-ecs-${var.cluster_name}-${var.name}-cloudfront-500-errors"
+  alarm_name                = try(data.aws_iam_account_alias.current[0].account_alias, "${var.alarm_prefix}-ecs-${var.name}-cloudfront-500-errors")
   comparison_operator       = "GreaterThanOrEqualToThreshold"
   evaluation_periods        = "3"
   metric_name               = "5xxErrorRate"
diff --git a/versions.tf b/versions.tf
index cd0f691..8bf1778 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,3 +1,3 @@
 terraform {
-  required_version = ">= 0.12.0"
+  required_version = ">= 0.12.20"
 }
\ No newline at end of file