diff --git a/external/boost/archive/portable_binary_iarchive.hpp b/external/boost/archive/portable_binary_iarchive.hpp
index bd19599f3..d17e95c05 100644
--- a/external/boost/archive/portable_binary_iarchive.hpp
+++ b/external/boost/archive/portable_binary_iarchive.hpp
@@ -258,7 +258,7 @@ portable_binary_iarchive::load_impl(boost::intmax_t & l, char maxsize){
     this->primitive_base_t::load_binary(cptr, size);
 
     #if BOOST_ENDIAN_BIG_BYTE
-        if(m_flags & endian_little)
+        if((m_flags & endian_little) || (!(m_flags & endian_big)))
     #else
         if(m_flags & endian_big)
     #endif
@@ -343,6 +343,8 @@ portable_binary_iarchive::init(unsigned int flags){
         );
         #endif
     }
+    if (!(m_flags & (endian_little | endian_big)))
+      m_flags |= endian_little;
     unsigned char x;
     load(x);
     m_flags = x << CHAR_BIT;
diff --git a/external/boost/archive/portable_binary_oarchive.hpp b/external/boost/archive/portable_binary_oarchive.hpp
index 783c7f7c9..a0ac0a9b5 100644
--- a/external/boost/archive/portable_binary_oarchive.hpp
+++ b/external/boost/archive/portable_binary_oarchive.hpp
@@ -171,7 +171,7 @@ protected:
 
     void init(unsigned int flags);
 public:
-    portable_binary_oarchive(std::ostream & os, unsigned flags = 0) :
+    portable_binary_oarchive(std::ostream & os, unsigned flags = endian_little) :
         primitive_base_t(
             * os.rdbuf(),
             0 != (flags & boost::archive::no_codecvt)