diff --git a/include/boost/throw_exception.hpp b/include/boost/throw_exception.hpp
index 5579a2d..200683e 100644
--- a/include/boost/throw_exception.hpp
+++ b/include/boost/throw_exception.hpp
@@ -9,7 +9,7 @@
 
 // MS compatible compilers support #pragma once
 
-#if defined(_MSC_VER)
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
 # pragma once
 #endif