diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/audio/gstnonstreamaudiodecoder.c b/subprojects/gst-plugins-bad/gst-libs/gst/audio/gstnonstreamaudiodecoder.c
index f98ddb014d..89b05e8333 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/audio/gstnonstreamaudiodecoder.c
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/audio/gstnonstreamaudiodecoder.c
@@ -2464,7 +2464,8 @@ gst_nonstream_audio_decoder_get_downstream_info (GstNonstreamAudioDecoder * dec,
  * This function may only be called from within @load_from_buffer,
  * @load_from_custom, and @decode.
  *
- * Returns: Newly allocated output buffer, or NULL if allocation failed
+ * Returns: (transfer full) (nullable): Newly allocated output buffer, or NULL
+ * if allocation failed
  */
 GstBuffer *
 gst_nonstream_audio_decoder_allocate_output_buffer (GstNonstreamAudioDecoder *