diff --git a/main.tf b/main.tf
index 690ec20..b5ccf61 100644
--- a/main.tf
+++ b/main.tf
@@ -212,7 +212,7 @@ resource "aws_ecs_service" "service" {
   ]
   name                               = var.name_prefix
   cluster                            = var.cluster_id
-  task_definition                    = aws_ecs_task_definition.task.arn
+  task_definition                    = var.task_definition != "" ? var.task_definition : aws_ecs_task_definition.task.arn
   desired_count                      = var.desired_count
   launch_type                        = "FARGATE"
   deployment_minimum_healthy_percent = var.deployment_minimum_healthy_percent
diff --git a/variables.tf b/variables.tf
index f3f4c5f..242c181 100644
--- a/variables.tf
+++ b/variables.tf
@@ -84,6 +84,12 @@ variable "task_container_protocol" {
   type        = string
 }
 
+variable "task_definition" {
+  description = "Provided task definition for the service."
+  default     = ""
+  type        = string
+}
+
 variable "task_definition_cpu" {
   description = "Amount of CPU to reserve for the task."
   default     = 256