diff --git a/Lib/struct.py b/Lib/struct.py
index b022355..dca15e2 100644
--- a/Lib/struct.py
+++ b/Lib/struct.py
@@ -1,3 +1,14 @@
+__all__ = [
+    # Functions
+    'calcsize', 'pack', 'unpack', 'unpack', 'unpack_from',
+
+    # Classes
+    'Struct',
+
+    # Exceptions
+    'error'
+    ]
+
 from _struct import *
 from _struct import _clearcache
 from _struct import __doc__