diff --git a/ArmNavigation/two_joint_arm_to_point_control/two_joint_arm_to_point_control.py b/ArmNavigation/two_joint_arm_to_point_control/two_joint_arm_to_point_control.py
index e674ae8a..0e91be0f 100644
--- a/ArmNavigation/two_joint_arm_to_point_control/two_joint_arm_to_point_control.py
+++ b/ArmNavigation/two_joint_arm_to_point_control/two_joint_arm_to_point_control.py
@@ -55,7 +55,7 @@ def two_joint_arm(GOAL_TH=0.0, theta1=0.0, theta2=0.0):
         wrist = plot_arm(theta1, theta2, x, y)
 
         # check goal
-        d2goal = np.math.sqrt((wrist[0] - x)**2 + (wrist[1] - y)**2)
+        d2goal = np.hypot(wrist[0] - x, wrist[1] - y)
 
         if abs(d2goal) < GOAL_TH and x is not None:
             return theta1, theta2