diff --git a/workers.tf b/workers.tf
index 587e6e0876..2a582cfb45 100644
--- a/workers.tf
+++ b/workers.tf
@@ -345,7 +345,7 @@ resource "aws_launch_configuration" "workers" {
         local.workers_group_defaults["root_encrypted"],
       )
       snapshot_id = lookup(
-        block_device_mappings.value,
+        ebs_block_device.value,
         "snapshot_id",
         local.workers_group_defaults["snapshot_id"],
       )