diff --git a/builtin/last-modified.c b/builtin/last-modified.c
index b0ecbdc5400d13..dc1e229f4d4f44 100644
--- a/builtin/last-modified.c
+++ b/builtin/last-modified.c
@@ -525,7 +525,8 @@ int cmd_last_modified(int argc, const char **argv, const char *prefix,
 
 	argc = parse_options(argc, argv, prefix, last_modified_options,
 			     last_modified_usage,
-			     PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT);
+			     PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT |
+			     PARSE_OPT_KEEP_DASHDASH);
 
 	repo_config(repo, git_default_config, NULL);
 
diff --git a/t/t8020-last-modified.sh b/t/t8020-last-modified.sh
index a4c1114ee28f7f..50f4312f715f41 100755
--- a/t/t8020-last-modified.sh
+++ b/t/t8020-last-modified.sh
@@ -78,6 +78,14 @@ test_expect_success 'last-modified subdir' '
 	EOF
 '
 
+test_expect_success 'last-modified in sparse checkout' '
+	test_when_finished "git sparse-checkout disable" &&
+	git sparse-checkout set b &&
+	check_last_modified -- a <<-\EOF
+	3 a
+	EOF
+'
+
 test_expect_success 'last-modified subdir recursive' '
 	check_last_modified -r a <<-\EOF
 	3 a/b/file