diff --git a/tasks/cafe/cafe.py b/tasks/cafe/cafe.py
index 525069a..e02d9df 100644
--- a/tasks/cafe/cafe.py
+++ b/tasks/cafe/cafe.py
@@ -72,7 +72,7 @@ class Cafe(UI):
     def _get_clickable_buttons(self, threshold=0.8, offset=(0, 0)):
         image = self.device.image
         h, w = image.shape[:2]
-        cv2.rectangle(image, (0, 10), (w - 25, h - 10), (0, 0, 0), 50)
+        image = cv2.rectangle(image, (0, 10), (w - 25, h - 10), (0, 0, 0), 50)
         image = self._extract_clickable_from_image(image)
         points = self._match_clickable_points(image, threshold)
         points = self.merge_points(points)