1 files changed, 6 insertions, 0 deletions
diff --git a/diff.c b/diff.c
index 5d6349feb3..22288b0106 100644
--- a/diff.c
+++ b/diff.c
@@ -4414,6 +4414,12 @@ void diff_flush(struct diff_options *options)
 
 	if (output_format & DIFF_FORMAT_PATCH) {
 		if (separator) {
+			if (options->output_prefix) {
+				struct strbuf *msg = NULL;
+				msg = options->output_prefix(options,
+					options->output_prefix_data);
+				fwrite(msg->buf, msg->len, 1, stdout);
+			}
 			putc(options->line_termination, options->file);
 			if (options->stat_sep) {
 				/* attach patch instead of inline */