diff --git a/scour.inkscape.py b/scour.inkscape.py
index ebbae81..e4b403e 100755
--- a/scour.inkscape.py
+++ b/scour.inkscape.py
@@ -57,7 +57,7 @@ class ScourInkscape (inkex.Effect):
             help="work around various renderer bugs (currently only librsvg)")
 
     def effect(self):   
-        input = file(sys.argv[12], "r")
+        input = file(self.args[0], "r")
         sys.stdout.write(scourString(input.read(), self.options).encode("UTF-8"))
         input.close()
         sys.stdout.close()