diff --git a/Lib/copy.py b/Lib/copy.py
index 07f1d23..089d101 100644
--- a/Lib/copy.py
+++ b/Lib/copy.py
@@ -51,6 +51,7 @@
 import types
 import weakref
 from copyreg import dispatch_table
+import builtins
 
 class Error(Exception):
     pass
@@ -109,7 +110,7 @@
 if t is not None:
     d[t] = _copy_immutable
 for name in ("complex", "unicode"):
-    t = globals()['__builtins__'].get(name)
+    t = getattr(builtins, name, None)
     if t is not None:
         d[t] = _copy_immutable