diff --git a/include/boost/logic/tribool.hpp b/include/boost/logic/tribool.hpp
index 90cba3e..167a72a 100644
--- a/include/boost/logic/tribool.hpp
+++ b/include/boost/logic/tribool.hpp
@@ -14,7 +14,7 @@
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
 
-#if BOOST_WORKAROUND(_MSC_VER, >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif
 
diff --git a/include/boost/logic/tribool_io.hpp b/include/boost/logic/tribool_io.hpp
index 9ee34d4..aa164ee 100644
--- a/include/boost/logic/tribool_io.hpp
+++ b/include/boost/logic/tribool_io.hpp
@@ -11,7 +11,7 @@
 #include <boost/detail/workaround.hpp>
 #include <boost/noncopyable.hpp>
 
-#if BOOST_WORKAROUND(_MSC_VER, >= 1200)
+#if defined(_MSC_VER)
 #  pragma once
 #endif