diff --git a/modules/eks-monitoring/locals.tf b/modules/eks-monitoring/locals.tf
index 7fcb60db..765d9846 100644
--- a/modules/eks-monitoring/locals.tf
+++ b/modules/eks-monitoring/locals.tf
@@ -80,7 +80,7 @@ locals {
 
   nginx_pattern_config = {
     # Merge input variable with defaults and rebuild with non-null values
-    for k, v in merge(local.nginx_pattern_config_defaults, var.nginx_config) : k => coalesce(v, local.nginx_pattern_config_defaults[k])
+    for k, v in merge(local.nginx_pattern_config_defaults, var.nginx_config) : k => v != null ? v :local.nginx_pattern_config_defaults[k]
   }
 
   istio_pattern_config = {