diff --git a/modules/vpc/outputs.tf b/modules/vpc/outputs.tf
index 2b8a30a6..205aabf9 100644
--- a/modules/vpc/outputs.tf
+++ b/modules/vpc/outputs.tf
@@ -30,6 +30,6 @@ output "network_self_link" {
 }
 
 output "project_id" {
-  value       = var.shared_vpc_host ? coalesce(google_compute_shared_vpc_host_project.shared_vpc_host.*.project...) : google_compute_network.network.project
+  value       = var.shared_vpc_host ? coalesce(flatten([google_compute_shared_vpc_host_project.shared_vpc_host.*.project])...) : google_compute_network.network.project
   description = "VPC project id"
 }