diff --git a/plugins/sources/mongodb.inc b/plugins/sources/mongodb.inc
index 9d838f1..9fac86c 100644
--- a/plugins/sources/mongodb.inc
+++ b/plugins/sources/mongodb.inc
@@ -59,14 +59,6 @@ class MigrateSourceMongoDB extends MigrateSource {
       }
     }
 
-    // if index don't exist we create one
-    if ($create_index) {
-      $this->collection->ensureIndex(
-        array('drupalMiration.destinationID' => 1),
-        array('name' => '_drupalMigration_')
-      );
-    }
-
     // ToDo: delete index if is not neccessary (0 migrated items?)
   }