diff --git a/gwcs/wcs.py b/gwcs/wcs.py
index e44bde42..ab97c996 100644
--- a/gwcs/wcs.py
+++ b/gwcs/wcs.py
@@ -523,8 +523,6 @@ def _call_backward(self, *args, with_bounding_box=True, fill_value=np.nan, **kwa
         except NotImplementedError:
             transform = None
 
-        with_bounding_box = kwargs.pop('with_bounding_box', True)
-        fill_value = kwargs.pop('fill_value', np.nan)
         if with_bounding_box and self.bounding_box is not None:
             args = self.outside_footprint(args)