diff --git a/examples/motion_detector.py b/examples/motion_detector.py
index da2b373..89cf4bf 100644
--- a/examples/motion_detector.py
+++ b/examples/motion_detector.py
@@ -58,7 +58,6 @@ def _(sample: npt.NDArray[np.complex64]) -> None:
     It is used to detect changes in the environment caused by motion, by comparing each
     entry in the matrix with a moving average
     """
-    global historical
     global sample_position
 
     historical[sample_position] = sample