diff --git a/ext/alsa/gstalsasink.c b/ext/alsa/gstalsasink.c
index 0c71ac113e..0439e970a8 100644
--- a/ext/alsa/gstalsasink.c
+++ b/ext/alsa/gstalsasink.c
@@ -377,6 +377,7 @@ gst_alsasink_acceptcaps (GstAlsaSink * alsa, GstCaps * caps)
   ret = TRUE;
 
 done:
+  gst_caps_replace (&spec.caps, NULL);
   return ret;
 }