diff --git a/extensions/fablabchemnitz/apply_transformations/apply_transformations.py b/extensions/fablabchemnitz/apply_transformations/apply_transformations.py
index c90b80ef..57b917fb 100644
--- a/extensions/fablabchemnitz/apply_transformations/apply_transformations.py
+++ b/extensions/fablabchemnitz/apply_transformations/apply_transformations.py
@@ -42,10 +42,10 @@ class ApplyTransformations(inkex.EffectExtension):
             style = element.attrib.get('style')
             style = dict(Style.parse_str(style))
             update = False
-
             if 'stroke-width' in style:
                 try:
-                    stroke_width = float(style.get('stroke-width').strip().replace("px", ""))
+                    #stroke_width = float(style.get('stroke-width').strip().replace("px", ""))
+                    stroke_width = self.svg.uutounit(style.get('stroke-width').strip())
                     stroke_width *= math.sqrt(abs(transf.a * transf.d))
                     style['stroke-width'] = str(stroke_width)
                     update = True