diff --git a/fractals/sierpinski_triangle.py b/fractals/sierpinski_triangle.py
index c28ec00b2..45f7ab84c 100644
--- a/fractals/sierpinski_triangle.py
+++ b/fractals/sierpinski_triangle.py
@@ -82,3 +82,4 @@ if __name__ == "__main__":
 
     vertices = [(-175, -125), (0, 175), (175, -125)]  # vertices of triangle
     triangle(vertices[0], vertices[1], vertices[2], int(sys.argv[1]))
+    turtle.Screen().exitonclick()