diff --git a/libraries/chain/include/graphene/chain/database.hpp b/libraries/chain/include/graphene/chain/database.hpp
index 483bfc8a..1bb628dd 100644
--- a/libraries/chain/include/graphene/chain/database.hpp
+++ b/libraries/chain/include/graphene/chain/database.hpp
@@ -263,6 +263,7 @@ namespace graphene { namespace chain {
          vector<witness_id_type> get_near_witness_schedule()const;
          void update_witness_schedule();
          void update_witness_schedule(const signed_block& next_block);
+         uint32_t update_witness_missed_blocks( const signed_block& b );
       
          void check_lottery_end_by_participants( asset_id_type asset_id );
          void check_ending_lotteries();