1 files changed, 2 insertions, 0 deletions
diff --git a/diff.c b/diff.c
index 93ef9a265c..d3d8daec77 100644
--- a/diff.c
+++ b/diff.c
@@ -3393,6 +3393,8 @@ int diff_opt_parse(struct diff_options *options, const char **av, int ac)
 		DIFF_XDL_SET(options, IGNORE_WHITESPACE_AT_EOL);
 	else if (!strcmp(arg, "--patience"))
 		DIFF_XDL_SET(options, PATIENCE_DIFF);
+	else if (!strcmp(arg, "--histogram"))
+		DIFF_XDL_SET(options, HISTOGRAM_DIFF);
 
 	/* flags options */
 	else if (!strcmp(arg, "--binary")) {