diff --git a/libraries/plugins/market_history/include/graphene/market_history/market_history_plugin.hpp b/libraries/plugins/market_history/include/graphene/market_history/market_history_plugin.hpp
index 201cf3a1..43639b25 100644
--- a/libraries/plugins/market_history/include/graphene/market_history/market_history_plugin.hpp
+++ b/libraries/plugins/market_history/include/graphene/market_history/market_history_plugin.hpp
@@ -128,10 +128,11 @@ class market_history_plugin : public graphene::app::plugin
 } } //graphene::market_history
 
 FC_REFLECT( graphene::market_history::bucket_key, (base)(quote)(seconds)(open) )
-FC_REFLECT( graphene::market_history::bucket_object, (key)
-                                                     (high_base)(high_quote)
-                                                     (low_base)(low_quote)
-                                                     (open_base)(open_quote)
-                                                     (close_base)(close_quote)
-                                                     (base_volume)(quote_volume) )
+FC_REFLECT_DERIVED( graphene::market_history::bucket_object, (graphene::db::object), 
+                    (key)
+                    (high_base)(high_quote)
+                    (low_base)(low_quote)
+                    (open_base)(open_quote)
+                    (close_base)(close_quote)
+                    (base_volume)(quote_volume) )
 
diff --git a/libraries/plugins/market_history/market_history_plugin.cpp b/libraries/plugins/market_history/market_history_plugin.cpp
index b2c87f3c..f5662021 100644
--- a/libraries/plugins/market_history/market_history_plugin.cpp
+++ b/libraries/plugins/market_history/market_history_plugin.cpp
@@ -106,7 +106,7 @@ struct operation_process_fill_order
           auto itr = by_key_idx.find( key );
           if( itr == by_key_idx.end() )
           { // create new bucket
-            const auto& obj = db.create<bucket_object>( [&]( bucket_object& b ){
+            db.create<bucket_object>( [&]( bucket_object& b ){
                  b.key = key;
                  b.quote_volume += trade_price.quote.amount;
                  b.base_volume += trade_price.base.amount;