diff --git a/main.tf b/main.tf
index 3b8d8d6..ed0d9d4 100644
--- a/main.tf
+++ b/main.tf
@@ -137,6 +137,7 @@ resource "github_repository_autolink_reference" "default" {
   key_prefix = each.value.key_prefix
 
   target_url_template = each.value.target_url_template
+  is_alphanumeric     = each.value.is_alphanumeric
 }