diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.c b/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.c
index 7e0e60d24b..2b6fcfd970 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.c
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.c
@@ -41,7 +41,8 @@
 /**
  * gst_vp9_bit_writer_frame_header:
  * @frame_hdr: the frame header of #GstVp9FrameHdr to write
- * @data: (out): the stream generated by the frame header
+ * @data: (out caller-allocates)(not nullable): the stream
+ *  generated by the frame header
  * @size: (inout): the size in bytes of the input and output
  *
  * Generating the according VP9 bit stream by providing the frame header.
diff --git a/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.h b/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.h
index 3dd8fed62e..997e4c8e87 100644
--- a/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.h
+++ b/subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gstvp9bitwriter.h
@@ -53,7 +53,7 @@ GST_CODEC_PARSERS_API
 GstVp9BitWriterResult     gst_vp9_bit_writer_superframe_info (guint frame_num,
                                                               const gint * frame_size,
                                                               guint8 * data,
-                                                              guint * total_size);
+                                                              guint * size);
 
 G_END_DECLS
 #endif /* __GST_VP9_BIT_WRITER_H__ */