diff --git a/main.tf b/main.tf
index fe791a0..60952d7 100644
--- a/main.tf
+++ b/main.tf
@@ -94,7 +94,7 @@ module "cluster" {
   }
 
   eks_managed_node_group_defaults = {
-    ami_type = "BOTTLEROCKET_X86_64"
+    ami_type = "BOTTLEROCKET_x86_64"
   }
 
   node_security_group_enable_recommended_rules = true