diff --git a/src/Jenssegers/Mongodb/Relations/MorphTo.php b/src/Jenssegers/Mongodb/Relations/MorphTo.php
index 704c472..5938f9e 100644
--- a/src/Jenssegers/Mongodb/Relations/MorphTo.php
+++ b/src/Jenssegers/Mongodb/Relations/MorphTo.php
@@ -31,7 +31,7 @@ protected function getResultsByType($type)
 
         $query = $instance->newQuery();
 
-        return $query->whereIn($key, $this->gatherKeysByType($type))->get();
+        return $query->whereIn($key, $this->gatherKeysByType($type, $instance->getKeyType()))->get();
     }
 
     /**