1 files changed, 2 insertions, 0 deletions
diff --git a/src/item.cc b/src/item.cc
index 30727c1b..df0ce920 100644
--- a/src/item.cc
+++ b/src/item.cc
@@ -105,7 +105,9 @@ optional<value_t> item_t::get_tag(const mask_t& tag_mask,
 
 namespace {
   struct CaseInsensitiveKeyCompare
+#if __cplusplus < 201103L
     : public std::binary_function<string, string, bool>
+#endif
   {
     bool operator()(const string& s1, const string& s2) const {
       return boost::algorithm::ilexicographical_compare(s1, s2);