diff --git a/subprojects/gstreamer/libs/gst/base/gstaggregator.c b/subprojects/gstreamer/libs/gst/base/gstaggregator.c
index a1a5b2d85a..b32b89508c 100644
--- a/subprojects/gstreamer/libs/gst/base/gstaggregator.c
+++ b/subprojects/gstreamer/libs/gst/base/gstaggregator.c
@@ -2032,7 +2032,9 @@ gst_aggregator_release_pad (GstElement * element, GstPad * pad)
 
   SRC_LOCK (self);
   gst_aggregator_pad_set_flushing (aggpad, GST_FLOW_FLUSHING, TRUE);
+  PAD_LOCK (aggpad);
   gst_buffer_replace (&aggpad->priv->peeked_buffer, NULL);
+  PAD_UNLOCK (aggpad);
   gst_element_remove_pad (element, pad);
 
   self->priv->has_peer_latency = FALSE;