diff --git a/libs/gst/base/gstbasetransform.c b/libs/gst/base/gstbasetransform.c
index db03bb777b..58b69a1940 100644
--- a/libs/gst/base/gstbasetransform.c
+++ b/libs/gst/base/gstbasetransform.c
@@ -2451,5 +2451,6 @@ gst_base_transform_reconfigure (GstBaseTransform * trans)
   GST_OBJECT_LOCK (trans);
   GST_DEBUG_OBJECT (trans, "marking reconfigure");
   trans->priv->reconfigure = TRUE;
+  gst_caps_replace (&trans->priv->sink_alloc, NULL);
   GST_OBJECT_UNLOCK (trans);
 }