diff --git a/src/ripple/protocol/impl/Feature.cpp b/src/ripple/protocol/impl/Feature.cpp
index 90c8fa14aee..848c1f7921b 100644
--- a/src/ripple/protocol/impl/Feature.cpp
+++ b/src/ripple/protocol/impl/Feature.cpp
@@ -29,7 +29,9 @@
 #include <boost/multi_index_container.hpp>
 #include <cstring>
 
-namespace boost {
+namespace ripple {
+
+enum class Supported : bool { no = false, yes };
 
 inline std::size_t
 hash_value(ripple::uint256 const& feature)
@@ -41,11 +43,6 @@ hash_value(ripple::uint256 const& feature)
     return seed;
 }
 
-}  // namespace boost
-namespace ripple {
-
-enum class Supported : bool { no = false, yes };
-
 namespace detail {
 // *NOTE*
 //
@@ -229,7 +226,7 @@ detail::FeatureCollections::registerFeature(
         }
 #endif
 
-        auto const& feature = features.emplace_back(name, f);
+        features.emplace_back(name, f);
 
         if (support == Supported::yes)
         {