diff --git a/nat.tf b/nat.tf
index 2991207..1d1f042 100644
--- a/nat.tf
+++ b/nat.tf
@@ -24,30 +24,30 @@ resource "google_compute_router_nat" "nats" {
   project                             = google_compute_router.router.project
   router                              = google_compute_router.router.name
   region                              = google_compute_router.router.region
-  nat_ip_allocate_option              = coalesce(each.value.nat_ip_allocate_option, length(lookup(each.value, "nat_ips", [])) > 0 ? "MANUAL_ONLY" : "AUTO_ONLY")
+  nat_ip_allocate_option              = coalesce(each.value.nat_ip_allocate_option, length(each.value.nat_ips) > 0 ? "MANUAL_ONLY" : "AUTO_ONLY")
   source_subnetwork_ip_ranges_to_nat  = coalesce(each.value.source_subnetwork_ip_ranges_to_nat, "ALL_SUBNETWORKS_ALL_IP_RANGES")
-  nat_ips                             = lookup(each.value, "nat_ips")
-  min_ports_per_vm                    = lookup(each.value, "min_ports_per_vm")
-  max_ports_per_vm                    = lookup(each.value, "max_ports_per_vm")
-  udp_idle_timeout_sec                = lookup(each.value, "udp_idle_timeout_sec")
-  icmp_idle_timeout_sec               = lookup(each.value, "icmp_idle_timeout_sec")
-  tcp_established_idle_timeout_sec    = lookup(each.value, "tcp_established_idle_timeout_sec")
-  tcp_transitory_idle_timeout_sec     = lookup(each.value, "tcp_transitory_idle_timeout_sec")
-  tcp_time_wait_timeout_sec           = lookup(each.value, "tcp_time_wait_timeout_sec")
-  enable_endpoint_independent_mapping = lookup(each.value, "enable_endpoint_independent_mapping")
-  enable_dynamic_port_allocation      = lookup(each.value, "enable_dynamic_port_allocation")
+  nat_ips                             = each.value.nat_ips
+  min_ports_per_vm                    = each.value.min_ports_per_vm
+  max_ports_per_vm                    = each.value.max_ports_per_vm
+  udp_idle_timeout_sec                = each.value.udp_idle_timeout_sec
+  icmp_idle_timeout_sec               = each.value.icmp_idle_timeout_sec
+  tcp_established_idle_timeout_sec    = each.value.tcp_established_idle_timeout_sec
+  tcp_transitory_idle_timeout_sec     = each.value.tcp_transitory_idle_timeout_sec
+  tcp_time_wait_timeout_sec           = each.value.tcp_time_wait_timeout_sec
+  enable_endpoint_independent_mapping = each.value.enable_endpoint_independent_mapping
+  enable_dynamic_port_allocation      = each.value.enable_dynamic_port_allocation
 
   log_config {
-    enable = lookup(lookup(each.value, "log_config", {}), "enable", true)
-    filter = lookup(lookup(each.value, "log_config", {}), "filter", "ALL")
+    enable = each.value.log_config.enable
+    filter = each.value.log_config.filter
   }
 
   dynamic "subnetwork" {
-    for_each = lookup(each.value, "subnetworks", [])
+    for_each = each.value.subnetworks
     content {
       name                     = subnetwork.value.name
       source_ip_ranges_to_nat  = subnetwork.value.source_ip_ranges_to_nat
-      secondary_ip_range_names = lookup(subnetwork.value, "secondary_ip_range_names", null)
+      secondary_ip_range_names = subnetwork.value.secondary_ip_range_names
     }
   }
 }