diff --git a/buildman/manager/executor.py b/buildman/manager/executor.py
index 786731992..806ff7845 100644
--- a/buildman/manager/executor.py
+++ b/buildman/manager/executor.py
@@ -120,7 +120,8 @@ class EC2Executor(BuilderExecutor):
     reservation = yield From(ec2_conn.run_instances(
         coreos_ami,
         instance_type=self.executor_config['EC2_INSTANCE_TYPE'],
-        security_groups=self.executor_config['EC2_SECURITY_GROUP_IDS'],
+        subnet_id=self.executor_config['EC2_VPC_SUBNET_ID'],
+        security_group_ids=self.executor_config['EC2_SECURITY_GROUP_IDS'],
         key_name=self.executor_config.get('EC2_KEY_NAME', None),
         user_data=user_data,
         instance_initiated_shutdown_behavior='terminate',