diff --git a/PathTracking/rear_wheel_feedback/rear_wheel_feedback.py b/PathTracking/rear_wheel_feedback/rear_wheel_feedback.py
index 285d9404..bf4f31b3 100644
--- a/PathTracking/rear_wheel_feedback/rear_wheel_feedback.py
+++ b/PathTracking/rear_wheel_feedback/rear_wheel_feedback.py
@@ -136,7 +136,7 @@ def closed_loop_prediction(cx, cy, cyaw, ck, speed_profile, goal):
         # check goal
         dx = state.x - goal[0]
         dy = state.y - goal[1]
-        if math.sqrt(dx ** 2 + dy ** 2) <= goal_dis:
+        if math.hypot(dx, dy) <= goal_dis:
             print("Goal")
             goal_flag = True
             break