diff --git a/patsy/eval.py b/patsy/eval.py
index dbb4817..d4ed83f 100644
--- a/patsy/eval.py
+++ b/patsy/eval.py
@@ -186,11 +186,11 @@ def capture(cls, eval_env=0, reference=0):
 
           x = 1
           this_env = EvalEnvironment.capture()
-          assert this_env["x"] == 1
+          assert this_env.namespace["x"] == 1
           def child_func():
               return EvalEnvironment.capture(1)
           this_env_from_child = child_func()
-          assert this_env_from_child["x"] == 1
+          assert this_env_from_child.namespace["x"] == 1
 
         Example::