diff --git a/src/cregex.cpp b/src/cregex.cpp
index 99d48a7b..fb12373a 100644
--- a/src/cregex.cpp
+++ b/src/cregex.cpp
@@ -28,6 +28,10 @@
 typedef boost::match_flag_type match_flag_type;
 #include <cstdio>
 
+#ifdef BOOST_MSVC
+#pragma warning(disable:4309)
+#endif
+
 namespace boost{
 
 #ifdef __BORLANDC__
@@ -641,3 +645,4 @@ basic_string<wchar_t>::replace<const wchar_t*>(wchar_t* f1, wchar_t* f2, const w
 
 
 
+