diff --git a/S3/main.tf b/S3/main.tf
index 74ceac38..70096065 100644
--- a/S3/main.tf
+++ b/S3/main.tf
@@ -62,7 +62,7 @@ resource "aws_s3_bucket" "this" {
 
       # Several blocks - transition
       dynamic "transition" {
-        for_each = length(keys(lookup(lifecycle_rule.value, "transition", []))) == 0 ? [] : lookup(lifecycle_rule.value, "transition", [])
+        for_each = length(keys(lookup(lifecycle_rule.value, "transition", {}))) == 0 ? [] : lookup(lifecycle_rule.value, "transition", {})
 
         content {
           date          = try(transition.value.date, null)