diff --git a/extensions/fablabchemnitz/buxtronix_living_hinges/buxtronix_living_hinges.py b/extensions/fablabchemnitz/buxtronix_living_hinges/buxtronix_living_hinges.py
index 552cd1da..2c7e5299 100755
--- a/extensions/fablabchemnitz/buxtronix_living_hinges/buxtronix_living_hinges.py
+++ b/extensions/fablabchemnitz/buxtronix_living_hinges/buxtronix_living_hinges.py
@@ -437,9 +437,16 @@ class BuxtronixLivingHinges(inkex.EffectExtension):
         if self.options.swatch or not self.svg.selected:
             draw_one(0, 0)
         else:
+            unit_factor = 1.0 / self.svg.uutounit(1.0,self.options.unit)
+            scale_factor = self.svg.unittouu("1px")
             for elem in self.svg.selected.values():
                 # Determine width and height based on the selected object's bounding box.
-                bbox = elem.bounding_box()
+                if isinstance (elem, inkex.Rectangle) or \
+                   isinstance (elem, inkex.Circle) or \
+                   isinstance (elem, inkex.Ellipse):
+                    bbox = elem.bounding_box()
+                else:
+                    bbox = elem.bounding_box() * (unit_factor / scale_factor)
                 self.options.width = self.svg.unittouu(bbox.width)
                 self.options.height = self.svg.unittouu(bbox.height)
                 x = self.svg.unittouu(bbox.x.minimum)