diff --git a/gst/audiomixer/gstaudiomixer.c b/gst/audiomixer/gstaudiomixer.c
index 9f75a8e46c..01521e517a 100644
--- a/gst/audiomixer/gstaudiomixer.c
+++ b/gst/audiomixer/gstaudiomixer.c
@@ -1199,7 +1199,7 @@ gst_audio_mixer_mix_buffer (GstAudioMixer * audiomixer, GstAudioMixerPad * pad,
       GstBuffer *buf;
       /* Buffer done, drop it */
       gst_buffer_replace (&pad->buffer, NULL);
-      buf = gst_aggregator_pad_steal_buffer (aggpad);
+      buf = gst_aggregator_pad_steal_buffer_unlocked (aggpad);
       if (buf)
         gst_buffer_unref (buf);
     }
@@ -1208,7 +1208,7 @@ gst_audio_mixer_mix_buffer (GstAudioMixer * audiomixer, GstAudioMixerPad * pad,
   }
 
   if (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP)) {
-    GstBuffer *aggpadbuf = gst_aggregator_pad_steal_buffer (aggpad);
+    GstBuffer *aggpadbuf = gst_aggregator_pad_steal_buffer_unlocked (aggpad);
 
     /* skip gap buffer */
     GST_LOG_OBJECT (pad, "skipping GAP buffer");
@@ -1330,7 +1330,7 @@ gst_audio_mixer_mix_buffer (GstAudioMixer * audiomixer, GstAudioMixerPad * pad,
 
     /* Buffer done, drop it */
     gst_buffer_replace (&pad->buffer, NULL);
-    buf = gst_aggregator_pad_steal_buffer (aggpad);
+    buf = gst_aggregator_pad_steal_buffer_unlocked (aggpad);
     if (buf)
       gst_buffer_unref (buf);
     GST_DEBUG_OBJECT (pad, "Finished mixing buffer, waiting for next");