diff --git a/libraries/chain/committee_member_evaluator.cpp b/libraries/chain/committee_member_evaluator.cpp
index d3756698..73d7703b 100644
--- a/libraries/chain/committee_member_evaluator.cpp
+++ b/libraries/chain/committee_member_evaluator.cpp
@@ -77,15 +77,7 @@ void_result committee_member_update_evaluator::do_apply( const committee_member_
 void_result committee_member_update_global_parameters_evaluator::do_evaluate(const committee_member_update_global_parameters_operation& o)
 { try {
    FC_ASSERT(trx_state->_is_proposed_trx);
-
-   if( db().head_block_time() < HARDFORK_1000_TIME ) // TODO: remove after hf
-      FC_ASSERT( !o.new_parameters.extensions.value.min_bet_multiplier.valid()
-                 && !o.new_parameters.extensions.value.max_bet_multiplier.valid()
-                 && !o.new_parameters.extensions.value.betting_rake_fee_percentage.valid()
-                 && !o.new_parameters.extensions.value.permitted_betting_odds_increments.valid()
-                 && !o.new_parameters.extensions.value.live_betting_delay_time.valid(),
-                 "Parameter extensions are not allowed yet!" );
-
+   
    dgpo = &db().get_global_properties();
    if( o.new_parameters.extensions.value.min_bet_multiplier.valid()
         && !o.new_parameters.extensions.value.max_bet_multiplier.valid() )
diff --git a/libraries/chain/include/graphene/chain/protocol/chain_parameters.hpp b/libraries/chain/include/graphene/chain/protocol/chain_parameters.hpp
index 20ed68e1..93098c21 100644
--- a/libraries/chain/include/graphene/chain/protocol/chain_parameters.hpp
+++ b/libraries/chain/include/graphene/chain/protocol/chain_parameters.hpp
@@ -34,19 +34,20 @@ namespace graphene { namespace chain { struct fee_schedule; } }
 namespace graphene { namespace chain {
    struct parameter_extension
    {
-      optional< bet_multiplier_type > min_bet_multiplier;
-      optional< bet_multiplier_type > max_bet_multiplier;
-      optional< uint16_t >            betting_rake_fee_percentage;
-      optional< flat_map<bet_multiplier_type, bet_multiplier_type> > permitted_betting_odds_increments;
-      optional< uint16_t >            live_betting_delay_time;
-      optional< uint16_t >            sweeps_distribution_percentage;
-      optional< asset_id_type >       sweeps_distribution_asset;
-      optional< account_id_type >     sweeps_vesting_accumulator_account;
+      optional< bet_multiplier_type > min_bet_multiplier                = GRAPHENE_DEFAULT_MIN_BET_MULTIPLIER;
+      optional< bet_multiplier_type > max_bet_multiplier                = GRAPHENE_DEFAULT_MAX_BET_MULTIPLIER;
+      optional< uint16_t >            betting_rake_fee_percentage       = GRAPHENE_DEFAULT_RAKE_FEE_PERCENTAGE;
+      optional< flat_map<bet_multiplier_type, bet_multiplier_type> > 
+      permitted_betting_odds_increments                                 = flat_map<bet_multiplier_type, bet_multiplier_type>(GRAPHENE_DEFAULT_PERMITTED_BETTING_ODDS_INCREMENTS);
+      optional< uint16_t >            live_betting_delay_time           = GRAPHENE_DEFAULT_LIVE_BETTING_DELAY_TIME;
+      optional< uint16_t >            sweeps_distribution_percentage    = SWEEPS_DEFAULT_DISTRIBUTION_PERCENTAGE;
+      optional< asset_id_type >       sweeps_distribution_asset         = SWEEPS_DEFAULT_DISTRIBUTION_ASSET;
+      optional< account_id_type >     sweeps_vesting_accumulator_account= SWEEPS_ACCUMULATOR_ACCOUNT;
       /* gpos parameters */
-      optional < uint32_t >           gpos_period;
-      optional < uint32_t >           gpos_subperiod;
+      optional < uint32_t >           gpos_period                       = GPOS_PERIOD;
+      optional < uint32_t >           gpos_subperiod                    = GPOS_SUBPERIOD;
       optional < uint32_t >           gpos_period_start;
-      optional < uint32_t >           gpos_vesting_lockin_period;
+      optional < uint32_t >           gpos_vesting_lockin_period        = GPOS_VESTING_LOCKIN_PERIOD;
    };
 
    struct chain_parameters
diff --git a/libraries/chain/proposal_evaluator.cpp b/libraries/chain/proposal_evaluator.cpp
index 0b42f371..88d985ff 100644
--- a/libraries/chain/proposal_evaluator.cpp
+++ b/libraries/chain/proposal_evaluator.cpp
@@ -45,15 +45,7 @@ struct proposal_operation_hardfork_visitor
    template<typename T>
    void operator()(const T &v) const {}
 
-   void operator()(const committee_member_update_global_parameters_operation &op) const {
-      if( block_time < HARDFORK_1000_TIME ) // TODO: remove after hf
-         FC_ASSERT( !op.new_parameters.extensions.value.min_bet_multiplier.valid()
-                    && !op.new_parameters.extensions.value.max_bet_multiplier.valid()
-                    && !op.new_parameters.extensions.value.betting_rake_fee_percentage.valid()
-                    && !op.new_parameters.extensions.value.permitted_betting_odds_increments.valid()
-                    && !op.new_parameters.extensions.value.live_betting_delay_time.valid(),
-                    "Parameter extensions are not allowed yet!" );
-   }
+   void operator()(const committee_member_update_global_parameters_operation &op) const {}
 
    void operator()(const graphene::chain::tournament_payout_operation &o) const {
       // TODO: move check into tournament_payout_operation::validate after HARDFORK_999_TIME