diff --git a/src/__private__/__length_between.scad b/src/__private__/__length_between.scad
deleted file mode 100644
index d9e4257e..00000000
--- a/src/__private__/__length_between.scad
+++ /dev/null
@@ -1,6 +0,0 @@
-function __length_between(p1, p2) =
-    let(
-        dx = p2[0] - p1[0],
-        dy = p2[1] - p1[1],
-        dz = p2[2] - p1[2]
-    ) sqrt(pow(dx, 2) + pow(dy, 2) + pow(dz, 2));
\ No newline at end of file
diff --git a/src/shape_path_extend.scad b/src/shape_path_extend.scad
index 913e716a..b21a2548 100644
--- a/src/shape_path_extend.scad
+++ b/src/shape_path_extend.scad
@@ -9,7 +9,6 @@
 **/
 
 include <__private__/__to3d.scad>;
-include <__private__/__length_between.scad>;
 include <__private__/__polytransversals.scad>;
 include <__private__/__reverse.scad>;
 
@@ -34,7 +33,7 @@ function _shape_path_first_stroke(stroke_pts, path_pts) =
 
 function _shape_path_extend_stroke(stroke_pts, p1, p2, scale_step, i) =
     let(
-        leng = __length_between(__to3d(p1), __to3d(p2)),
+        leng = norm(__to3d(p2) - __to3d(p1)),
         a = _shape_path_extend_az(p1, p2)
     )
     [