diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index c350967f0..430ae71ac 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -425,6 +425,18 @@ test_expect_success 'am --resolved works' '
 	test_cmp expected another
 '
 
+test_expect_success 'am --resolved fails if index has no changes' '
+	rm -fr .git/rebase-apply &&
+	git reset --hard &&
+	git checkout lorem2^^ &&
+	test_must_fail git am lorem-move.patch &&
+	test_path_is_dir .git/rebase-apply &&
+	test_cmp_rev lorem2^^ HEAD &&
+	test_must_fail git am --resolved &&
+	test_path_is_dir .git/rebase-apply &&
+	test_cmp_rev lorem2^^ HEAD
+'
+
 test_expect_success 'am takes patches from a Pine mailbox' '
 	rm -fr .git/rebase-apply &&
 	git reset --hard &&