1 files changed, 1 insertions, 1 deletions
diff --git a/diff.c b/diff.c
index 974626a621..dd68281ba4 100644
--- a/diff.c
+++ b/diff.c
@@ -5661,7 +5661,7 @@ int diff_opt_parse(struct diff_options *options,
 
 	ac = parse_options(ac, av, prefix, options->parseopts, NULL,
 			   PARSE_OPT_KEEP_DASHDASH |
-			   PARSE_OPT_KEEP_UNKNOWN |
+			   PARSE_OPT_KEEP_UNKNOWN_OPT |
 			   PARSE_OPT_NO_INTERNAL_HELP |
 			   PARSE_OPT_ONE_SHOT |
 			   PARSE_OPT_STOP_AT_NON_OPTION);