Fix test failures on 64-bit Windows

Hopefully.  Appveyor should tell me if I've succeeded.

Fixes #17.

1 files changed, 4 insertions, 2 deletions

diff --git a/src/zope/security/proxy.py b/src/zope/security/proxy.py
index ccfd111..d7f12e2 100644
--- a/src/zope/security/proxy.py
+++ b/src/zope/security/proxy.py
@@ -51,10 +51,12 @@ def _fmt_address(obj):
     # Try to replicate PyString_FromString("%p", obj), which actually uses
     # the platform sprintf(buf, "%p", obj), which we cannot access from Python
     # directly (and ctypes seems like overkill).
-    if sys.platform == 'win32':
+    if sys.platform != 'win32':
+        return '0x%0x' % id(obj)
+    elif sys.maxsize < 2**32:
         return '0x%08X' % id(obj)
     else:
-        return '0x%0x' % id(obj)
+        return '0x%016X' % id(obj)
 
 
 class ProxyPy(PyProxyBase):