diff --git a/include/boost/functional/hash/detail/float_functions.hpp b/include/boost/functional/hash/detail/float_functions.hpp
index 4b8374d..648b433 100644
--- a/include/boost/functional/hash/detail/float_functions.hpp
+++ b/include/boost/functional/hash/detail/float_functions.hpp
@@ -9,7 +9,7 @@
 #include <boost/config.hpp>
 #include <boost/config/no_tr1/cmath.hpp>
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/functional/hash/detail/hash_float.hpp b/include/boost/functional/hash/detail/hash_float.hpp
index 7c3de31..b2866f8 100644
--- a/include/boost/functional/hash/detail/hash_float.hpp
+++ b/include/boost/functional/hash/detail/hash_float.hpp
@@ -6,7 +6,7 @@
 #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER)
 #define BOOST_FUNCTIONAL_HASH_DETAIL_HASH_FLOAT_HEADER
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/functional/hash/detail/limits.hpp b/include/boost/functional/hash/detail/limits.hpp
index f5b520e..e48b950 100644
--- a/include/boost/functional/hash/detail/limits.hpp
+++ b/include/boost/functional/hash/detail/limits.hpp
@@ -9,7 +9,7 @@
 #if !defined(BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER)
 #define BOOST_FUNCTIONAL_HASH_DETAIL_LIMITS_HEADER
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/functional/hash/extensions.hpp b/include/boost/functional/hash/extensions.hpp
index 998c08e..76b7d51 100644
--- a/include/boost/functional/hash/extensions.hpp
+++ b/include/boost/functional/hash/extensions.hpp
@@ -32,7 +32,7 @@
 #   include <memory>
 #endif
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/functional/hash/hash_fwd.hpp b/include/boost/functional/hash/hash_fwd.hpp
index 1d51b07..0422efd 100644
--- a/include/boost/functional/hash/hash_fwd.hpp
+++ b/include/boost/functional/hash/hash_fwd.hpp
@@ -10,7 +10,7 @@
 #if !defined(BOOST_FUNCTIONAL_HASH_FWD_HPP)
 #define BOOST_FUNCTIONAL_HASH_FWD_HPP
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif