diff --git a/gst-libs/gst/audio/gstaudiodecoder.c b/gst-libs/gst/audio/gstaudiodecoder.c
index b6c8a3be9d..1a812788fa 100644
--- a/gst-libs/gst/audio/gstaudiodecoder.c
+++ b/gst-libs/gst/audio/gstaudiodecoder.c
@@ -1000,6 +1000,7 @@ gst_audio_decoder_push_buffers (GstAudioDecoder * dec, gboolean force)
           break;
         } else if (ret == GST_FLOW_OK) {
           GST_LOG_OBJECT (dec, "frame at offset %d of length %d", offset, len);
+          g_assert (len);
           g_assert (offset + len <= av);
           priv->sync_flush = 0;
         } else {