diff --git a/src/JsonGlobIterator.php b/src/JsonGlobIterator.php
index c29f226bfaef93a22cc8966b79b9156cb7e0cc40..42d97c1af0998903c6bf3fef890385c012e98194 100644
--- a/src/JsonGlobIterator.php
+++ b/src/JsonGlobIterator.php
@@ -22,7 +22,7 @@ class JsonGlobIterator extends GlobIterator {
     if (!is_array($data)) {
       $data = [];
     }
-    $data['id'] = $current->getBasename();
+    $data['id'] = substr($current->getBasename(), 0, -5);
     return $data;
   }