diff --git a/rally.py b/rally.py
index e4378d0..1315910 100644
--- a/rally.py
+++ b/rally.py
@@ -36,7 +36,7 @@ def find_aruco(image):
     if corners is None:
         return []
 
-    return {ids[i][0]: box[0].tolist() for i, box in enumerate(corners)}
+    return {ids[i][0]: box[0] for i, box in enumerate(corners)}
 
 def main():
     landmark_order = LANDMARKS + [