diff --git a/Objects/exceptions.c b/Objects/exceptions.c
index 369365b..be9627c 100644
--- a/Objects/exceptions.c
+++ b/Objects/exceptions.c
@@ -1967,6 +1967,29 @@
     if (PyDict_SetItemString(bdict, # TYPE, PyExc_ ## TYPE)) \
         Py_FatalError("Module dictionary insertion problem.");
 
+#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
+/* crt variable checking in VisualStudio .NET 2005 */
+#include <crtdbg.h>
+
+static int	prevCrtReportMode;
+static _invalid_parameter_handler	prevCrtHandler;
+
+/* Invalid parameter handler.  Sets a ValueError exception */
+static void
+InvalidParameterHandler(
+    const wchar_t * expression,
+    const wchar_t * function,
+    const wchar_t * file,
+    unsigned int line,
+    uintptr_t pReserved)
+{
+    /* Do nothing, allow execution to continue.  Usually this
+     * means that the CRT will set errno to EINVAL
+     */
+}
+#endif
+
+
 PyMODINIT_FUNC
 _PyExc_Init(void)
 {
@@ -2096,6 +2119,13 @@
         Py_FatalError("Cannot pre-allocate MemoryError instance\n");
 
     Py_DECREF(bltinmod);
+
+#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
+    /* Set CRT argument error handler */
+    prevCrtHandler = _set_invalid_parameter_handler(InvalidParameterHandler);
+    /* turn off assertions in debug mode */
+    prevCrtReportMode = _CrtSetReportMode(_CRT_ASSERT, 0);
+#endif
 }
 
 void
@@ -2103,4 +2133,9 @@
 {
     Py_XDECREF(PyExc_MemoryErrorInst);
     PyExc_MemoryErrorInst = NULL;
+#if defined _MSC_VER && _MSC_VER >= 1400 && defined(__STDC_SECURE_LIB__)
+    /* reset CRT error handling */
+    _set_invalid_parameter_handler(prevCrtHandler);
+    _CrtSetReportMode(_CRT_ASSERT, prevCrtReportMode);
+#endif
 }