diff --git a/make_bar_graph.py b/make_bar_graph.py
index 9f4cf0f..822ee0b 100644
--- a/make_bar_graph.py
+++ b/make_bar_graph.py
@@ -1,3 +1,4 @@
+import os
 import pandas as pd
 import numpy as np
 import altair as alt