diff --git a/Lib/importlib/__init__.py b/Lib/importlib/__init__.py
--- a/Lib/importlib/__init__.py
+++ b/Lib/importlib/__init__.py
@@ -1,18 +1,27 @@
 """A pure Python implementation of import."""
 __all__ = ['__import__', 'import_module', 'invalidate_caches']
 
-from . import _bootstrap
+# Bootstrap help #####################################################
+import imp
+import sys
 
+try:
+    _bootstrap = sys.modules['_frozen_importlib']
+except ImportError:
+    from . import _bootstrap
+else:
+    # importlib._bootstrap is the built-in import, ensure we don't create
+    # a second copy of the module.
+    _bootstrap.__name__ = 'importlib._bootstrap'
+    _bootstrap.__package__ = 'importlib'
+    _bootstrap.__file__ = __file__.replace('__init__.py', '_bootstrap.py')
+    sys.modules['importlib._bootstrap'] = _bootstrap
 
 # To simplify imports in test code
 _w_long = _bootstrap._w_long
 _r_long = _bootstrap._r_long
 
 
-# Bootstrap help #####################################################
-import imp
-import sys
-
 _bootstrap._setup(sys, imp)