diff --git a/Tools/bgen/bgen/macsupport.py b/Tools/bgen/bgen/macsupport.py
index 0f21b3fcf62..f8570e43165 100644
--- a/Tools/bgen/bgen/macsupport.py
+++ b/Tools/bgen/bgen/macsupport.py
@@ -36,6 +36,9 @@ def OSTypeType(typename):
 OSType = OSTypeType("OSType")
 ResType = OSTypeType("ResType")
 
+# Version numbers
+NumVersion = OpaqueByValueType("NumVersion", "PyMac_BuildNumVersion", "BUG")
+
 # Handles (always resources in our case)
 Handle = OpaqueByValueType("Handle", "ResObj")
 MenuHandle = OpaqueByValueType("MenuHandle", "MenuObj")