diff --git a/gst-libs/gst/audio/gstaudiodecoder.h b/gst-libs/gst/audio/gstaudiodecoder.h
index ba4fff3484..bde1cfc40f 100644
--- a/gst-libs/gst/audio/gstaudiodecoder.h
+++ b/gst-libs/gst/audio/gstaudiodecoder.h
@@ -41,6 +41,8 @@ G_BEGIN_DECLS
   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_DECODER))
 #define GST_IS_AUDIO_DECODER_CLASS(obj) \
   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_DECODER))
+#define GST_AUDIO_DECODER_CAST(obj) \
+  ((GstAudioDecoder *)(obj))
 
 /**
  * GST_AUDIO_DECODER_SINK_NAME: