diff --git a/workers_launch_template.tf b/workers_launch_template.tf
index 3b16ff1..1602437 100644
--- a/workers_launch_template.tf
+++ b/workers_launch_template.tf
@@ -385,7 +385,7 @@ resource "aws_launch_template" "workers_launch_template" {
   }
 
   dynamic "instance_market_options" {
-    for_each = lookup(var.worker_groups_launch_template[count.index], "market_type", null) == null ? [] : list(lookup(var.worker_groups_launch_template[count.index], "market_type", null))
+    for_each = lookup(var.worker_groups_launch_template[count.index], "market_type", null) == null ? [] : tolist([lookup(var.worker_groups_launch_template[count.index], "market_type", null)])
     content {
       market_type = instance_market_options.value
     }