diff --git a/packages/@aws-cdk/aws-ecs/lib/drain-hook/instance-drain-hook.ts b/packages/@aws-cdk/aws-ecs/lib/drain-hook/instance-drain-hook.ts
index 49e4bd2bd6ddd..f436138178c5e 100644
--- a/packages/@aws-cdk/aws-ecs/lib/drain-hook/instance-drain-hook.ts
+++ b/packages/@aws-cdk/aws-ecs/lib/drain-hook/instance-drain-hook.ts
@@ -70,7 +70,7 @@ export class InstanceDrainHook extends cdk.Construct {
       heartbeatTimeout: drainTime,
     });
 
-    const containerInstanceResource = Stack.of(this).formatArn({
+    const containerInstanceArn = Stack.of(this).formatArn({
       service: 'ecs',
       resource: 'containerInstance',
       resourceName: props.cluster.clusterName.concat('*')
@@ -115,7 +115,7 @@ export class InstanceDrainHook extends cdk.Construct {
         'ecs:UpdateContainerInstancesState',
         'ecs:ListTasks'
       ],
-      resources: [containerInstanceResource]
+      resources: [containerInstanceArn]
     }));
   }
 }