diff --git a/src/__private__/__lines_from.scad b/src/__private__/__lines_from.scad
index 47fd8754..b91a3a92 100644
--- a/src/__private__/__lines_from.scad
+++ b/src/__private__/__lines_from.scad
@@ -1,7 +1,7 @@
 function __lines_from(pts, closed = false) = 
     let(leng = len(pts))
     concat(
-        [for(i = [0:leng - 2]) [pts[i], pts[i + 1]]], 
+        [for(i = 0; i < leng - 1; i = i + 1) [pts[i], pts[i + 1]]], 
         closed ? [[pts[len(pts) - 1], pts[0]]] : []
     );
     
\ No newline at end of file
diff --git a/src/__private__/__pie_for_rounding.scad b/src/__private__/__pie_for_rounding.scad
index 5ea0f6c8..c67024b6 100644
--- a/src/__private__/__pie_for_rounding.scad
+++ b/src/__private__/__pie_for_rounding.scad
@@ -5,7 +5,7 @@ function __pie_for_rounding(r, begin_a, end_a, frags) =
         is_integer = frags % 1 == 0
     )
     r < 0.00005 ? [[0, 0]] : concat([
-        for(ang = [begin_a:step_a:end_a])
+        for(ang = begin_a; ang <= end_a; ang = ang + step_a)
             [
                 r * cos(ang), 
                 r * sin(ang)
diff --git a/src/__private__/__polytransversals.scad b/src/__private__/__polytransversals.scad
index 6fcb8647..3239f88a 100644
--- a/src/__private__/__polytransversals.scad
+++ b/src/__private__/__polytransversals.scad
@@ -3,12 +3,12 @@ function __polytransversals(transversals) =
         leng_trs = len(transversals),
         leng_tr = len(transversals[0]),
         lefts = [
-            for(i = [1:leng_trs - 2]) 
+            for(i = 1; i < leng_trs - 1; i = i + 1)
                 let(tr = transversals[leng_trs - i])
                     tr[0]
         ],
         rights = [
-            for(i = [1:leng_trs - 2]) 
+            for(i = 1; i < leng_trs - 1; i = i + 1)
                 let(tr = transversals[i])
                     tr[leng_tr - 1]
         ]
diff --git a/src/__private__/__shape_pie.scad b/src/__private__/__shape_pie.scad
index 5bc862de..967b3168 100644
--- a/src/__private__/__shape_pie.scad
+++ b/src/__private__/__shape_pie.scad
@@ -11,7 +11,7 @@ function __shape_pie(radius, angle) =
         shape_pts = concat(
             [[0, 0], __ra_to_xy(edge_r_begin, angles[0])],
             m > n ? [] : [
-                for(i = [m:n]) 
+                for(i = m; i <= n; i = i + 1)
                     let(a = a_step * i) 
                     __ra_to_xy(radius, a)
             ],