diff --git a/packages/@aws-cdk/aws-ec2/lib/security-group.ts b/packages/@aws-cdk/aws-ec2/lib/security-group.ts
index e3b63b42f48af..ab66118204d2c 100644
--- a/packages/@aws-cdk/aws-ec2/lib/security-group.ts
+++ b/packages/@aws-cdk/aws-ec2/lib/security-group.ts
@@ -432,7 +432,7 @@ export class SecurityGroup extends SecurityGroupBase {
         vpcId: options.vpc?.vpcId,
       },
       dummyValue: {
-        securityGroupId: 'sg-12345',
+        securityGroupId: 'sg-12345678',
         allowAllOutbound: true,
       } as cxapi.SecurityGroupContextResponse,
     }).value;