diff --git a/src/jinjaturtle/core.py b/src/jinjaturtle/core.py
index e4f3d13..9020b6f 100644
--- a/src/jinjaturtle/core.py
+++ b/src/jinjaturtle/core.py
@@ -4,6 +4,7 @@ from pathlib import Path
 from typing import Any, Iterable
 
 import datetime
+import os
 import yaml
 
 from .loop_analyzer import LoopAnalyzer, LoopCandidate