diff --git a/topics/geometry.py b/topics/geometry.py
index 2312e74b..8e3f910b 100644
--- a/topics/geometry.py
+++ b/topics/geometry.py
@@ -356,7 +356,7 @@ class Line(VMobject):
     def insert_n_anchor_points(self, n):
         if not self.path_arc:
             n_anchors = self.get_num_anchor_points()
-            new_num_points = 3*(n_anchors + n)+1
+            new_num_points = 3*(n_anchors + n)-2
             self.points = np.array([
                 self.point_from_proportion(alpha)
                 for alpha in np.linspace(0, 1, new_num_points)