diff --git a/include/boost/phoenix/stl/algorithm/detail/has_equal_range.hpp b/include/boost/phoenix/stl/algorithm/detail/has_equal_range.hpp
index b18067a..e0144e9 100644
--- a/include/boost/phoenix/stl/algorithm/detail/has_equal_range.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/has_equal_range.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 #pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/has_lower_bound.hpp b/include/boost/phoenix/stl/algorithm/detail/has_lower_bound.hpp
index eca0eb1..da6baa0 100644
--- a/include/boost/phoenix/stl/algorithm/detail/has_lower_bound.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/has_lower_bound.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 #pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/has_remove_if.hpp b/include/boost/phoenix/stl/algorithm/detail/has_remove_if.hpp
index e8f311f..22a0087 100644
--- a/include/boost/phoenix/stl/algorithm/detail/has_remove_if.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/has_remove_if.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 #pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/has_reverse.hpp b/include/boost/phoenix/stl/algorithm/detail/has_reverse.hpp
index 2cb425e..f514fcf 100644
--- a/include/boost/phoenix/stl/algorithm/detail/has_reverse.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/has_reverse.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 #pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/has_unique.hpp b/include/boost/phoenix/stl/algorithm/detail/has_unique.hpp
index 5f1b547..a5b12c4 100644
--- a/include/boost/phoenix/stl/algorithm/detail/has_unique.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/has_unique.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 #pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/is_std_set.hpp b/include/boost/phoenix/stl/algorithm/detail/is_std_set.hpp
index 52c87e9..e44a047 100644
--- a/include/boost/phoenix/stl/algorithm/detail/is_std_set.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/is_std_set.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 # pragma once
 #endif
 
diff --git a/include/boost/phoenix/stl/algorithm/detail/std_hash_map_fwd.hpp b/include/boost/phoenix/stl/algorithm/detail/std_hash_map_fwd.hpp
index d78c6b7..93131f0 100644
--- a/include/boost/phoenix/stl/algorithm/detail/std_hash_map_fwd.hpp
+++ b/include/boost/phoenix/stl/algorithm/detail/std_hash_map_fwd.hpp
@@ -12,7 +12,7 @@
 //
 /////////////////////////////////////////////////////////////////////////////
 
-#if defined(_MSC_VER) && _MSC_VER >= 1000
+#if defined(_MSC_VER)
 # pragma once
 #endif