--- mupdf-1.5/source/fitz/load-jpx.c
+++ mupdf-1.5/source/fitz/load-jpx.c
@@ -116,7 +116,7 @@
 	opj_stream_set_read_function(stream, fz_opj_stream_read);
 	opj_stream_set_skip_function(stream, fz_opj_stream_skip);
 	opj_stream_set_seek_function(stream, fz_opj_stream_seek);
-	opj_stream_set_user_data(stream, &sb);
+	opj_stream_set_user_data(stream, &sb, NULL);
 	/* Set the length to avoid an assert */
 	opj_stream_set_user_data_length(stream, size);