diff --git a/src/in_polyline.scad b/src/in_polyline.scad
index 08bdaeba..f0b093a2 100644
--- a/src/in_polyline.scad
+++ b/src/in_polyline.scad
@@ -18,5 +18,5 @@ function _in_polyline_sub(pts, pt, epsilon, iend, i = 0) =
     );
 
 function in_polyline(line_pts, pt, epsilon = 0.0001) = 
-    _in_polyline_sub(line_pts, pt, epsilon, len(pts) - 1);
+    _in_polyline_sub(line_pts, pt, epsilon, len(line_pts) - 1);
     
\ No newline at end of file