diff --git a/gwcs/wcs.py b/gwcs/wcs.py
index 97f2da14..db0b1a80 100644
--- a/gwcs/wcs.py
+++ b/gwcs/wcs.py
@@ -718,7 +718,7 @@ def numerical_inverse(self, *args, tolerance=1e-5, maxiter=30, adaptive=True,
         >>> import numpy as np
 
         >>> filename = get_pkg_data_filename('data/nircamwcs.asdf', package='gwcs.tests')
-        >>> with asdf.open(filename, copy_arrays=True, lazy_load=False, ignore_missing_extensions=True) as af:
+        >>> with asdf.open(filename, lazy_load=False, ignore_missing_extensions=True) as af:
         ...    w = af.tree['wcs']
 
         >>> ra, dec = w([1,2,3], [1,1,1])