diff --git a/include/boost/regex/v4/perl_matcher_non_recursive.hpp b/include/boost/regex/v4/perl_matcher_non_recursive.hpp
index e7e1071f..bf77eaa5 100644
--- a/include/boost/regex/v4/perl_matcher_non_recursive.hpp
+++ b/include/boost/regex/v4/perl_matcher_non_recursive.hpp
@@ -34,7 +34,7 @@
 #endif
 #ifdef BOOST_MSVC
 #  pragma warning(push)
-#  pragma warning(disable: 4800)
+#  pragma warning(disable: 4800 4706)
 #endif
 
 namespace boost{