diff --git a/packages/@aws-cdk/aws-ecs-patterns/test/fargate/integ.scheduled-fargate-task.lit.expected.json b/packages/@aws-cdk/aws-ecs-patterns/test/fargate/integ.scheduled-fargate-task.lit.expected.json
index f1eac0a73c85c..981eb3df2d63f 100644
--- a/packages/@aws-cdk/aws-ecs-patterns/test/fargate/integ.scheduled-fargate-task.lit.expected.json
+++ b/packages/@aws-cdk/aws-ecs-patterns/test/fargate/integ.scheduled-fargate-task.lit.expected.json
@@ -602,7 +602,7 @@
         ]
       }
     },
-    "ScheduledFargateTaskScheduledTaskDefPutTargets7149EAB4": {
+    "ScheduledFargateTaskScheduledTaskDefScheduledEventRuleTarget0PutTargets4F6BAABA": {
       "Type": "Custom::AWS",
       "Properties": {
         "ServiceToken": {
diff --git a/packages/@aws-cdk/aws-events-targets/lib/ecs-task.ts b/packages/@aws-cdk/aws-events-targets/lib/ecs-task.ts
index 67aff8edd376b..82735b8378675 100644
--- a/packages/@aws-cdk/aws-events-targets/lib/ecs-task.ts
+++ b/packages/@aws-cdk/aws-events-targets/lib/ecs-task.ts
@@ -70,7 +70,8 @@ export class EcsTask implements events.IRuleTarget {
     this.taskCount = props.taskCount !== undefined ? props.taskCount : 1;
 
     if (this.taskDefinition.networkMode === ecs.NetworkMode.AWS_VPC) {
-      this.securityGroup = props.securityGroup || new ec2.SecurityGroup(this.taskDefinition, 'SecurityGroup', { vpc: this.props.cluster.vpc });
+      const securityGroup = props.securityGroup || this.taskDefinition.node.tryFindChild('SecurityGroup') as ec2.ISecurityGroup;
+      this.securityGroup = securityGroup || new ec2.SecurityGroup(this.taskDefinition, 'SecurityGroup', { vpc: this.props.cluster.vpc });
     }
   }
 
@@ -117,7 +118,7 @@ export class EcsTask implements events.IRuleTarget {
       const subnetSelection = this.props.subnetSelection || { subnetType: ec2.SubnetType.PRIVATE };
       const assignPublicIp = subnetSelection.subnetType === ec2.SubnetType.PRIVATE ? 'DISABLED' : 'ENABLED';
 
-      new custom.AwsCustomResource(this.taskDefinition, 'PutTargets', {
+      new custom.AwsCustomResource(this.taskDefinition, `${rule.node.id}${id}PutTargets`, {
         // `onCreate´ defaults to `onUpdate` and we don't need an `onDelete` here
         // because the rule/target will be owned by CF anyway.
         onUpdate: {
diff --git a/packages/@aws-cdk/aws-events-targets/test/ecs/event-rule-target.test.ts b/packages/@aws-cdk/aws-events-targets/test/ecs/event-rule-target.test.ts
index 3184ce249da5c..d7758bdefebff 100644
--- a/packages/@aws-cdk/aws-events-targets/test/ecs/event-rule-target.test.ts
+++ b/packages/@aws-cdk/aws-events-targets/test/ecs/event-rule-target.test.ts
@@ -184,5 +184,70 @@ test("Can use Fargate taskdef as EventRule target", () => {
       }
     ]
   });
+});
+
+test("Can use same fargate taskdef with multiple rules", () => {
+  // GIVEN
+  const stack = new cdk.Stack();
+  const vpc = new ec2.Vpc(stack, 'Vpc', { maxAzs: 1 });
+  const cluster = new ecs.Cluster(stack, 'EcsCluster', { vpc });
+
+  const taskDefinition = new ecs.FargateTaskDefinition(stack, 'TaskDef');
+  taskDefinition.addContainer('TheContainer', {
+    image: ecs.ContainerImage.fromRegistry('henk'),
+  });
+
+  const scheduledRule = new events.Rule(stack, 'ScheduleRule', {
+    schedule: events.Schedule.expression('rate(1 min)')
+  });
+
+  const patternRule = new events.Rule(stack, 'PatternRule', {
+    eventPattern: {
+      detail: ['test']
+    }
+  });
+
+  scheduledRule.addTarget(new targets.EcsTask({
+    cluster,
+    taskDefinition,
+  }));
+
+  expect(() => patternRule.addTarget(new targets.EcsTask({
+    cluster,
+    taskDefinition
+  }))).not.toThrow();
+});
+
+test("Can use same fargate taskdef multiple times in a rule", () => {
+  // GIVEN
+  const stack = new cdk.Stack();
+  const vpc = new ec2.Vpc(stack, 'Vpc', { maxAzs: 1 });
+  const cluster = new ecs.Cluster(stack, 'EcsCluster', { vpc });
 
+  const taskDefinition = new ecs.FargateTaskDefinition(stack, 'TaskDef');
+  taskDefinition.addContainer('TheContainer', {
+    image: ecs.ContainerImage.fromRegistry('henk'),
+  });
+
+  const rule = new events.Rule(stack, 'ScheduleRule', {
+    schedule: events.Schedule.expression('rate(1 min)')
+  });
+
+  rule.addTarget(new targets.EcsTask({
+    cluster,
+    taskDefinition,
+    containerOverrides: [{
+      containerName: 'TheContainer',
+      command: ['echo', events.EventField.fromPath('$.detail.a')],
+    }]
+  }));
+
+  expect(() => rule.addTarget(new targets.EcsTask({
+    cluster,
+    taskDefinition,
+    containerOverrides: [{
+      containerName: 'TheContainer',
+      command: ['echo', events.EventField.fromPath('$.detail.b')],
+    }]
+  }))).not.toThrow();
 });
diff --git a/packages/@aws-cdk/aws-events-targets/test/ecs/integ.event-fargate-task.expected.json b/packages/@aws-cdk/aws-events-targets/test/ecs/integ.event-fargate-task.expected.json
index 8ff9da4e62423..ffdf409e2f7ec 100644
--- a/packages/@aws-cdk/aws-events-targets/test/ecs/integ.event-fargate-task.expected.json
+++ b/packages/@aws-cdk/aws-events-targets/test/ecs/integ.event-fargate-task.expected.json
@@ -565,7 +565,7 @@
         ]
       }
     },
-    "TaskDefPutTargetsF699575F": {
+    "TaskDefRuleTarget0PutTargets77691785": {
       "Type": "Custom::AWS",
       "Properties": {
         "ServiceToken": {