diff --git a/src/util/_impl/_sort_impl.scad b/src/util/_impl/_sort_impl.scad
index c63135f1..e2381c75 100644
--- a/src/util/_impl/_sort_impl.scad
+++ b/src/util/_impl/_sort_impl.scad
@@ -10,7 +10,7 @@ function _sort(lt, i) =
 
 function _sort_impl(lt, by, idx) =
     let(
-        dict = [["x", 0], ["y", 1], ["z", 0], ["idx", idx]],
-        i = dict[search(by, dict)[0]][1]
+        dict = [["x", 0], ["y", 1], ["z", 0], ["i", idx]],
+        i = dict[search(by == "idx" ? "i" : by, dict)[0]][1]
     )
     _sort(lt, i);
\ No newline at end of file