diff --git a/bisect.c b/bisect.c
index 21bc6daa43..8e63c40d27 100644
--- a/bisect.c
+++ b/bisect.c
@@ -747,7 +747,7 @@ static void handle_bad_merge_base(void)
 		exit(3);
 	}
 
-	fprintf(stderr, _("Some %s revs are not ancestor of the %s rev.\n"
+	fprintf(stderr, _("Some %s revs are not ancestors of the %s rev.\n"
 		"git bisect cannot work properly in this case.\n"
 		"Maybe you mistook %s and %s revs?\n"),
 		term_good, term_bad, term_good, term_bad);