diff --git a/gst-libs/gst/codecparsers/gsth264parser.h b/gst-libs/gst/codecparsers/gsth264parser.h
index ed34feb128..b8de5759f4 100644
--- a/gst-libs/gst/codecparsers/gsth264parser.h
+++ b/gst-libs/gst/codecparsers/gsth264parser.h
@@ -559,6 +559,9 @@ struct _GstH264SliceHdr
   /* calculated values */
   guint32 max_pic_num;
   gboolean valid;
+
+  /* Size of the slice_header() in bits */
+  guint header_size;
 };