diff --git a/Listener/IndexSubscriber.php b/Listener/IndexSubscriber.php
index 526a380..b13bdc8 100644
--- a/Listener/IndexSubscriber.php
+++ b/Listener/IndexSubscriber.php
@@ -107,8 +107,9 @@ public function postFlush(PostFlushEventArgs $ea)
      */
     private function scheduleForIndexation($entity)
     {
-        if ($this->isManaged($entity) && !in_array($entity, $this->scheduledIndexations)) {
-            $this->scheduledIndexations[] = $entity;
+        $entityHash = spl_object_hash($entity);
+        if ($this->isManaged($entity) && !isset($this->scheduledIndexations[$entityHash])) {
+            $this->scheduledIndexations[$entityHash] = $entity;
         }
     }
 
@@ -119,8 +120,9 @@ private function scheduleForIndexation($entity)
      */
     private function scheduleForUnindexation($entity)
     {
-        if ($this->isManaged($entity) && !in_array($entity, $this->scheduledUnindexations)) {
-            $this->scheduledUnindexations[]= $entity;
+        $entityHash = spl_object_hash($entity);
+        if ($this->isManaged($entity) && !isset($this->scheduledUnindexations[$entityHash])) {
+            $this->scheduledUnindexations[$entityHash] = $entity;
         }
     }
 
@@ -149,4 +151,4 @@ private function isManaged($entity)
 
         return $managed;
     }
-}
\ No newline at end of file
+}