diff --git a/include/fallback/seq.hpp b/include/fallback/seq.hpp
index 3346588c..58dcf899 100644
--- a/include/fallback/seq.hpp
+++ b/include/fallback/seq.hpp
@@ -13,8 +13,9 @@
 //                  http://www.gnu.org/licenses/                              //
 //****************************************************************************//
 
+#ifndef HPCOMBI_FALLBACK_SEQ_HPP_INCLUDED
+#define HPCOMBI_FALLBACK_SEQ_HPP_INCLUDED
 
-#if __cplusplus <= 201103L
 namespace bwcompat_details {
   // Copy pasted from sources
 
@@ -80,4 +81,5 @@ namespace std {
     using index_sequence_for = make_index_sequence<sizeof...(_Types)>;
 
 }  // namespace std
-#endif
+
+#endif  // HPCOMBI_FALLBACK_SEQ_HPP_INCLUDED
diff --git a/include/hpcombi.hpp b/include/hpcombi.hpp
new file mode 100644
index 00000000..91f1f51d
--- /dev/null
+++ b/include/hpcombi.hpp
@@ -0,0 +1,21 @@
+//****************************************************************************//
+//       Copyright (C) 2016 Florent Hivert <Florent.Hivert@lri.fr>,           //
+//                                                                            //
+//  Distributed under the terms of the GNU General Public License (GPL)       //
+//                                                                            //
+//    This code is distributed in the hope that it will be useful,            //
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of          //
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       //
+//   General Public License for more details.                                 //
+//                                                                            //
+//  The full text of the GPL is available at:                                 //
+//                                                                            //
+//                  http://www.gnu.org/licenses/                              //
+//****************************************************************************//
+
+#ifndef HPCOMBI_HPCOMBI_HPP_INCLUDED
+#define HPCOMBI_HPCOMBI_HPP_INCLUDED
+
+#include "perm16"
+
+#define HPCOMBI_HPCOMBI_HPP_INCLUDED
diff --git a/include/perm16.hpp b/include/perm16.hpp
index c6924073..4f2b3e64 100644
--- a/include/perm16.hpp
+++ b/include/perm16.hpp
@@ -22,11 +22,13 @@
 #include <functional>  // less<>
 #include <ostream>
 #include <x86intrin.h>
-#include "fallback/seq.hpp"
-
 
 #include "HPCombi-config.h"
 
+#if __cplusplus <= 201103L
+#include "fallback/seq.hpp"
+#endif
+
 #ifdef HPCOMBI_CONSTEXPR_FUN_ARGS
   #define HPCOMBI_CONSTEXPR constexpr
   #define HPCOMBI_CONSTEXPR_CONSTRUCTOR constexpr
@@ -35,7 +37,6 @@
   #define HPCOMBI_CONSTEXPR_CONSTRUCTOR
 #endif
 
-
 namespace HPCombi {
 
 /// SIMD vector of 16 unsigned bytes