diff --git a/testdata/scad/bugs/issue495a.scad b/testdata/scad/bugs/issue495a.scad
new file mode 100644
index 00000000..37f382ca
--- /dev/null
+++ b/testdata/scad/bugs/issue495a.scad
@@ -0,0 +1,8 @@
+// Hollow cube.
+// STL export is wrong (inner cube is positive instead of negative)
+// This is fixed by applying and using the patch to CGAL containing
+// convert_all_inner_shells_to_polyhedron()
+difference() {
+    cube(20, center = true);
+    cube(10, center = true);
+}