diff --git a/subprojects/gstreamer/libs/gst/base/gstaggregator.c b/subprojects/gstreamer/libs/gst/base/gstaggregator.c
index 956c1c895d..4abb14247c 100644
--- a/subprojects/gstreamer/libs/gst/base/gstaggregator.c
+++ b/subprojects/gstreamer/libs/gst/base/gstaggregator.c
@@ -1636,7 +1636,7 @@ gst_aggregator_flush_start (GstAggregator * self, GstAggregatorPad * aggpad,
   PAD_FLUSH_UNLOCK (aggpad);
 }
 
-/* Must be called with the the PAD_LOCK held */
+/* Must be called with the PAD_LOCK and OBJECT_LOCK held */
 static void
 update_time_level (GstAggregatorPad * aggpad, gboolean head)
 {
@@ -3101,7 +3101,9 @@ apply_buffer (GstAggregatorPad * aggpad, GstBuffer * buffer, gboolean head)
   else
     aggpad->priv->tail_position = timestamp;
 
+  GST_OBJECT_LOCK (aggpad);
   update_time_level (aggpad, head);
+  GST_OBJECT_UNLOCK (aggpad);
 }
 
 /*