diff --git a/aws/service.ts b/aws/service.ts
index 741c309c..af882ba0 100644
--- a/aws/service.ts
+++ b/aws/service.ts
@@ -130,7 +130,7 @@ function createLoadBalancer(
 
     const loadBalancer = new aws.elasticloadbalancingv2.LoadBalancer(shortName, {
         loadBalancerType: useAppLoadBalancer ? "application" : "network",
-        subnetMappings: network.publicSubnetIds.map(s => ({ subnetId: s })),
+        subnets: network.publicSubnetIds,
         internal: internal,
         // If this is an application LB, we need to associate it with the ECS cluster's security group, so
         // that traffic on any ports can reach it.  Otherwise, leave blank, and default to the VPC's group.