diff --git a/examples/mask_app/app.py b/examples/mask_app/app.py
index 881efba7..23a5fc78 100644
--- a/examples/mask_app/app.py
+++ b/examples/mask_app/app.py
@@ -1,5 +1,4 @@
 import cv2
-import numpy as np
 import streamlit as st
 from PIL import Image
 from streamlit_drawable_canvas import st_canvas