diff --git a/Object.php b/Object.php
index 644b425..a311cf0 100644
--- a/Object.php
+++ b/Object.php
@@ -559,7 +559,7 @@ public function ingestDatastream(&$ds) {
     if (!isset($this->datastreams[$ds->id])) {
       // The datastream does not already belong to this object, aka was created
       // by this object.
-      if ($ds->parent != $this) {
+      if ($ds->parent !== $this) {
         // Create a NewFedoraDatastream copy.
         $this->createNewDatastreamCopy($ds);
       }