diff --git a/main.tf b/main.tf
index 18933422f5..562e9d9495 100644
--- a/main.tf
+++ b/main.tf
@@ -53,7 +53,7 @@ resource "aws_eks_cluster" "this" {
   }
 
   dynamic "compute_config" {
-    for_each = length(var.cluster_compute_config) > 0 ? [var.cluster_compute_config] : []
+    for_each = local.auto_mode_enabled ? [var.cluster_compute_config] : []
 
     content {
       enabled       = local.auto_mode_enabled
diff --git a/variables.tf b/variables.tf
index 855c2133ec..91ad761ec6 100644
--- a/variables.tf
+++ b/variables.tf
@@ -47,6 +47,7 @@ variable "authentication_mode" {
 variable "cluster_compute_config" {
   description = "Configuration block for the cluster compute configuration"
   type        = any
+  nullable    = false
   default     = {}
 }