diff -r ddf15cd9be4a Modules/posixmodule.c
--- a/Modules/posixmodule.c	Thu Jul 26 18:12:07 2012 -0400
+++ b/Modules/posixmodule.c	Fri Jul 27 12:57:54 2012 +0900
@@ -1509,7 +1509,7 @@
 }
 
 /* Grab GetFinalPathNameByHandle dynamically from kernel32 */
-static int has_GetFinalPathNameByHandle = 0;
+static int has_GetFinalPathNameByHandle = -1;
 static DWORD (CALLBACK *Py_GetFinalPathNameByHandleW)(HANDLE, LPWSTR, DWORD,
                                                       DWORD);
 static int
@@ -1520,7 +1520,7 @@
                                                    DWORD);
 
     /* only recheck */
-    if (!has_GetFinalPathNameByHandle)
+    if (-1 == has_GetFinalPathNameByHandle)
     {
         hKernel32 = GetModuleHandleW(L"KERNEL32");
         *(FARPROC*)&Py_GetFinalPathNameByHandleA = GetProcAddress(hKernel32,