diff --git a/extensions/fablabchemnitz_ofsplot.py b/extensions/fablabchemnitz_ofsplot.py
index 9bfe840f..26184782 100644
--- a/extensions/fablabchemnitz_ofsplot.py
+++ b/extensions/fablabchemnitz_ofsplot.py
@@ -19,8 +19,10 @@ class ofsplot(inkex.Effect):
         self.arg_parser.add_argument("--clipperscale", type=float, default=1024.0, help="Scaling factor")
         
     def effect(self):
-        paths = self.svg.selection.filter(inkex.PathElement)
-        if len(paths) == 0:
+        paths = self.svg.get_selected(inkex.PathElement)
+        count = sum(1 for path in paths)
+        paths = self.svg.get_selected(inkex.PathElement) #we need to call this twice because the sum function consumes the generator
+        if count == 0:
             inkex.errormsg("No paths selected.")
             exit()
         for path in paths:
@@ -79,4 +81,4 @@ class ofsplot(inkex.Effect):
 
                 path.set('d',CubicSuperPath(new))
 
-ofsplot().run()
\ No newline at end of file
+ofsplot().run()