diff --git a/PathPlanning/RRT/rrt_with_pathsmoothing.py b/PathPlanning/RRT/rrt_with_pathsmoothing.py
index 242838fd..70dd55a3 100644
--- a/PathPlanning/RRT/rrt_with_pathsmoothing.py
+++ b/PathPlanning/RRT/rrt_with_pathsmoothing.py
@@ -9,6 +9,7 @@ import matplotlib.pyplot as plt
 import random
 import math
 import copy
+import numpy as np
 
 show_animation = True