diff --git a/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c b/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
index 6fadbba956..0e9d0b6b14 100644
--- a/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
+++ b/subprojects/gst-plugins-good/gst/matroska/matroska-read-common.c
@@ -592,8 +592,9 @@ gst_matroska_parse_protection_meta (gpointer * data_out, gsize * size_out,
     gst_structure_set (info_protect, "subsample_count", G_TYPE_UINT, 0, NULL);
   }
 
-  gst_byte_reader_get_data (&reader, 0, (const guint8 **) data_out);
   *size_out = gst_byte_reader_get_remaining (&reader);
+  gst_byte_reader_get_data (&reader, *size_out, (const guint8 **) data_out);
+
   return TRUE;
 
 release_err: