diff --git a/Lib/types.py b/Lib/types.py
index 41accfc94df..0d5174314cb 100644
--- a/Lib/types.py
+++ b/Lib/types.py
@@ -16,6 +16,7 @@
 IntType = int
 LongType = long
 FloatType = float
+BooleanType = bool
 try:
     ComplexType = complex
 except NameError: