diff --git a/include/boost/unordered/detail/fca.hpp b/include/boost/unordered/detail/fca.hpp
index 3929294d..19fafe73 100644
--- a/include/boost/unordered/detail/fca.hpp
+++ b/include/boost/unordered/detail/fca.hpp
@@ -113,11 +113,6 @@ to normal separate chaining implementations.
 
 */
 
-#include <boost/config.hpp>
-#if defined(BOOST_HAS_PRAGMA_ONCE)
-#pragma once
-#endif
-
 #include <boost/unordered/detail/prime_fmod.hpp>
 
 #include <boost/core/addressof.hpp>
@@ -132,6 +127,8 @@ to normal separate chaining implementations.
 #include <boost/type_traits/aligned_storage.hpp>
 #include <boost/type_traits/alignment_of.hpp>
 
+#include <boost/config.hpp>
+
 #include <iterator>
 
 namespace boost {
diff --git a/include/boost/unordered/detail/prime_fmod.hpp b/include/boost/unordered/detail/prime_fmod.hpp
index 8806bb44..885c071b 100644
--- a/include/boost/unordered/detail/prime_fmod.hpp
+++ b/include/boost/unordered/detail/prime_fmod.hpp
@@ -7,16 +7,13 @@
 #ifndef BOOST_UNORDERED_DETAIL_PRIME_FMOD_HPP
 #define BOOST_UNORDERED_DETAIL_PRIME_FMOD_HPP
 
-#include <boost/config.hpp>
-#if defined(BOOST_HAS_PRAGMA_ONCE)
-#pragma once
-#endif
-
 #include <boost/cstdint.hpp>
 #include <boost/preprocessor/seq/enum.hpp>
 #include <boost/preprocessor/seq/for_each.hpp>
 #include <boost/preprocessor/seq/size.hpp>
 
+#include <boost/config.hpp>
+
 #include <climits>
 #include <cstddef>