diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index c0280de..12e1c83 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1227,7 +1227,9 @@
 
 #define ISSLASHA(c) ((c) == '\\' || (c) == '/')
 #define ISSLASHW(c) ((c) == L'\\' || (c) == L'/')
+#ifndef ARRAYSIZE
 #define ARRAYSIZE(a) (sizeof(a) / sizeof(a[0]))
+#endif
 
 static BOOL
 IsUNCRootA(char *path, int pathlen)
diff --git a/PC/pyconfig.h b/PC/pyconfig.h
index cb42131..14a32db 100644
--- a/PC/pyconfig.h
+++ b/PC/pyconfig.h
@@ -164,6 +164,12 @@
 #define Py_IS_INFINITY(X) (!_finite(X) && !_isnan(X))
 #define Py_IS_FINITE(X) _finite(X)
 
+/* Turn off warnings about deprecated C runtime functions in 
+   VisualStudio .NET 2005 */
+#if _MSC_VER >= 1400 && !defined _CRT_SECURE_NO_DEPRECATE
+#define _CRT_SECURE_NO_DEPRECATE
+#endif
+
 #endif /* _MSC_VER */
 
 /* define some ANSI types that are not defined in earlier Win headers */