diff --git a/main.tf b/main.tf
index 93777b29..522d16df 100644
--- a/main.tf
+++ b/main.tf
@@ -99,6 +99,6 @@ resource "google_compute_firewall" "default-hc" {
 
   allow {
     protocol = "tcp"
-    ports    = ["${element(split(",", element(var.backend_params, count.index)), 2)}"]
+    ports    = ["${element(split(",", element(split("|", join("", list(join("|", var.backend_params), replace(format("%*s", length(var.backend_params), ""), " ", "|")))), count.index)), 2)}"]
   }
 }