diff --git a/builtin-prune.c b/builtin-prune.c
index 71caac5..25f9304 100644
--- a/builtin-prune.c
+++ b/builtin-prune.c
@@ -140,8 +140,19 @@
 	init_revisions(&revs, prefix);
 
 	argc = parse_options(argc, argv, options, prune_usage, 0);
-	if (argc)
-		die ("unrecognized argument: %s", name);
+	while (argc--) {
+		unsigned char sha1[20];
+		const char *name = *argv++;
+
+		if (!get_sha1(name, sha1)) {
+			struct object *object = parse_object(sha1);
+			if (!object)
+				die("bad object: %s", name);
+			add_pending_object(&revs, object, "");
+		}
+		else
+			die("unrecognized argument: %s", name);
+	}
 	mark_reachable_objects(&revs, 1);
 	prune_object_dir(get_object_directory());
 
diff --git a/t/t5304-prune.sh b/t/t5304-prune.sh
index 3d81e1f..9fd9d07 100644
--- a/t/t5304-prune.sh
+++ b/t/t5304-prune.sh
@@ -100,7 +100,7 @@
 
 '
 
-test_expect_failure 'prune: do not prune heads listed as an argument' '
+test_expect_success 'prune: do not prune heads listed as an argument' '
 
 	: > file2 &&
 	git add file2 &&