diff --git a/include/boost/checked_delete.hpp b/include/boost/checked_delete.hpp
index 9bb84e8..80f936a 100644
--- a/include/boost/checked_delete.hpp
+++ b/include/boost/checked_delete.hpp
@@ -3,7 +3,7 @@
 
 // MS compatible compilers support #pragma once
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/current_function.hpp b/include/boost/current_function.hpp
index cb36e35..2904789 100644
--- a/include/boost/current_function.hpp
+++ b/include/boost/current_function.hpp
@@ -3,7 +3,7 @@
 
 // MS compatible compilers support #pragma once
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/ref.hpp b/include/boost/ref.hpp
index 6058d69..90d033c 100644
--- a/include/boost/ref.hpp
+++ b/include/boost/ref.hpp
@@ -3,7 +3,7 @@
 
 // MS compatible compilers support #pragma once
 
-#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+#if defined(_MSC_VER)
 # pragma once
 #endif