diff --git a/tests/check_added_large_files_test.py b/tests/check_added_large_files_test.py
index 54c4e68..81f9561 100644
--- a/tests/check_added_large_files_test.py
+++ b/tests/check_added_large_files_test.py
@@ -96,6 +96,16 @@ def test_allows_gitlfs(temp_git_dir):  # pragma: no cover
         # Should succeed
         assert main(('--maxkb', '9', 'f.py')) == 0
 
+@xfailif_no_gitlfs
+def test_disallows_gitlfs_when_specified(temp_git_dir):  # pragma: no cover
+    with temp_git_dir.as_cwd():
+        cmd_output('git', 'lfs', 'install', '--local')
+        temp_git_dir.join('f.py').write('a' * 10000)
+        cmd_output('git', 'lfs', 'track', 'f.py')
+        cmd_output('git', 'add', '--', '.')
+        # Should reject file
+        assert main(('--maxkb', '9', '--allow-in-lfs', 'false', 'f.py')) == 1
+
 
 @xfailif_no_gitlfs
 def test_moves_with_gitlfs(temp_git_dir):  # pragma: no cover