diff --git a/src/rotate_p.scad b/src/rotate_p.scad
index 7480cfcb..49b62f5c 100644
--- a/src/rotate_p.scad
+++ b/src/rotate_p.scad
@@ -72,7 +72,7 @@ function _rotz(pt, a) =
 function _rotate_p_3d(point, a) =
     _rotz(_roty(_rotx(point, a[0]), a[1]), a[2]);
 
-function to_avect(a) =
+function _to_avect(a) =
      len(a) == 3 ? a : (
          len(a) == 2 ? [a[0], a[1], 0] : (
              len(a) == 1 ? [a[0], 0, 0] : [0, 0, a]
@@ -80,7 +80,7 @@ function to_avect(a) =
      );
 
 function _rotate_p(p, a) =
-    let(angle = to_avect(a))
+    let(angle = _to_avect(a))
     len(p) == 3 ? 
         _rotate_p_3d(p, angle) :
         __to2d(