diff --git a/src/collection/hashset.scad b/src/collection/hashset.scad
index 46b45030..f4a4ccc5 100644
--- a/src/collection/hashset.scad
+++ b/src/collection/hashset.scad
@@ -37,10 +37,4 @@ function hashset_del(set, elem, eq = df_eq, hash = df_hash) =
 	    slice(set, 0, bidx), 
 		[concat(slice(bucket, 0, i), slice(bucket, i + 1))],
 		slice(set, bidx + 1)
-	);
-
-function hashset_list(set) = [
-    for(bucket = set) 
-        for(elem = bucket)
-            elem		
-];
\ No newline at end of file
+	);
\ No newline at end of file
diff --git a/src/collection/hashset_list.scad b/src/collection/hashset_list.scad
new file mode 100644
index 00000000..9baf73e8
--- /dev/null
+++ b/src/collection/hashset_list.scad
@@ -0,0 +1,5 @@
+function hashset_list(set) = [
+    for(bucket = set) 
+        for(elem = bucket)
+            elem		
+];
\ No newline at end of file
diff --git a/src/voxel/vx_bezier.scad b/src/voxel/vx_bezier.scad
index 14e89ccc..9262cf28 100644
--- a/src/voxel/vx_bezier.scad
+++ b/src/voxel/vx_bezier.scad
@@ -12,6 +12,7 @@ use <__comm__/__to2d.scad>;
 use <__comm__/__to3d.scad>;
 use <_impl/_vx_bezier_impl.scad>;
 use <collection/hashset.scad>;
+use <collection/hashset_list.scad>;
 
 function vx_bezier(p1, p2, p3, p4) = 
     let(
diff --git a/src/voxel/vx_circle.scad b/src/voxel/vx_circle.scad
index 41595644..00e73311 100644
--- a/src/voxel/vx_circle.scad
+++ b/src/voxel/vx_circle.scad
@@ -10,6 +10,7 @@
 
 use <_impl/_vx_circle_impl.scad>;
 use <collection/hashset.scad>;
+use <collection/hashset_list.scad>;
 
 function vx_circle(radius, filled = false) = 
     let(all = _vx_circle_impl(radius, filled))
diff --git a/src/voxel/vx_polygon.scad b/src/voxel/vx_polygon.scad
index fe477726..3ff58869 100644
--- a/src/voxel/vx_polygon.scad
+++ b/src/voxel/vx_polygon.scad
@@ -2,6 +2,7 @@ use <../in_shape.scad>;
 use <../util/sort.scad>;
 use <vx_polyline.scad>;
 use <collection/hashset.scad>;
+use <collection/hashset_list.scad>;
 
 function vx_polygon(points, filled = false) =
     let(contour = vx_polyline(concat(points, [points[0]])))
diff --git a/src/voxel/vx_union.scad b/src/voxel/vx_union.scad
index 344a0c61..d5f2ca46 100644
--- a/src/voxel/vx_union.scad
+++ b/src/voxel/vx_union.scad
@@ -9,6 +9,7 @@
 **/ 
 
 use <collection/hashset.scad>;
+use <collection/hashset_list.scad>;
 
 function vx_union(points1, points2) =
     hashset_list(
diff --git a/test/collection/test_hashset.scad b/test/collection/test_hashset.scad
index f0845af0..d0fd5b1e 100644
--- a/test/collection/test_hashset.scad
+++ b/test/collection/test_hashset.scad
@@ -1,5 +1,6 @@
 use <unittest.scad>;
 use <collection/hashset.scad>;
+use <collection/hashset_list.scad>;
 
 module test_hashset() {
     echo("==== test_hashset ====");