diff --git a/libraries/chain/database.cpp b/libraries/chain/database.cpp
index 237dc0c7b0..20ec10ea35 100644
--- a/libraries/chain/database.cpp
+++ b/libraries/chain/database.cpp
@@ -3405,6 +3405,7 @@ void database::update_global_dynamic_data( const signed_block& b )
 
          modify( witness_missed, [&]( witness_object& w )
          {
+            w.current_run = 0;
             if( witness_missed.owner != b.witness )
             {
                //
@@ -3490,6 +3491,9 @@ void database::update_signing_witness(const witness_object& signing_witness, con
    {
       _wit.last_aslot = new_block_aslot;
       _wit.last_confirmed_block_num = new_block.block_num();
+      if( _wit.current_run >= STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN )
+         _wit.last_supported_block_num = _wit.last_confirmed_block_num;
+      _wit.current_run++;
    } );
 } FC_CAPTURE_AND_RETHROW() }
 
@@ -3532,10 +3536,10 @@ void database::update_last_irreversible_block()
       std::nth_element( wit_objs.begin(), wit_objs.begin() + offset, wit_objs.end(),
          []( const witness_object* a, const witness_object* b )
          {
-            return a->last_confirmed_block_num < b->last_confirmed_block_num;
+            return a->last_supported_block_num < b->last_supported_block_num;
          } );
 
-      uint32_t new_last_irreversible_block_num = wit_objs[offset]->last_confirmed_block_num;
+      uint32_t new_last_irreversible_block_num = wit_objs[offset]->last_supported_block_num;
 
       if( new_last_irreversible_block_num > dpo.last_irreversible_block_num )
       {
diff --git a/libraries/chain/include/steem/chain/witness_objects.hpp b/libraries/chain/include/steem/chain/witness_objects.hpp
index 62bfe73dd2..28e5c448c3 100644
--- a/libraries/chain/include/steem/chain/witness_objects.hpp
+++ b/libraries/chain/include/steem/chain/witness_objects.hpp
@@ -76,6 +76,10 @@ namespace steem { namespace chain {
          uint32_t          total_missed = 0;
          uint64_t          last_aslot = 0;
          uint64_t          last_confirmed_block_num = 0;
+         /** Number of blocks produced since beginning of time or last missed block */
+         uint64_t          current_run = 0;
+         /** Last block produced when current_run >= STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN */
+         uint64_t          last_supported_block_num = 0;
 
          /**
           * Some witnesses have the job because they did a proof of work,
@@ -272,7 +276,8 @@ FC_REFLECT( steem::chain::witness_object,
              (owner)
              (created)
              (url)(votes)(schedule)(virtual_last_update)(virtual_position)(virtual_scheduled_time)(total_missed)
-             (last_aslot)(last_confirmed_block_num)(pow_worker)(signing_key)
+             (last_aslot)(last_confirmed_block_num)(current_run)(last_supported_block_num)
+             (pow_worker)(signing_key)
              (props)
              (sbd_exchange_rate)(last_sbd_exchange_update)
              (last_work)
diff --git a/libraries/protocol/get_config.cpp b/libraries/protocol/get_config.cpp
index 179c5b4e32..033647bc1c 100644
--- a/libraries/protocol/get_config.cpp
+++ b/libraries/protocol/get_config.cpp
@@ -85,6 +85,7 @@ fc::variant_object get_config()
 #endif
    result["STEEM_INIT_SUPPLY"] = STEEM_INIT_SUPPLY;
    result["STEEM_INIT_TIME"] = STEEM_INIT_TIME;
+   result["STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN"] = STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN;
    result["STEEM_IRREVERSIBLE_THRESHOLD"] = STEEM_IRREVERSIBLE_THRESHOLD;
    result["STEEM_LIQUIDITY_APR_PERCENT"] = STEEM_LIQUIDITY_APR_PERCENT;
    result["STEEM_LIQUIDITY_REWARD_BLOCKS"] = STEEM_LIQUIDITY_REWARD_BLOCKS;
diff --git a/libraries/protocol/include/steem/protocol/config.hpp b/libraries/protocol/include/steem/protocol/config.hpp
index 3c48d9d376..8396bf1e6a 100644
--- a/libraries/protocol/include/steem/protocol/config.hpp
+++ b/libraries/protocol/include/steem/protocol/config.hpp
@@ -253,6 +253,8 @@
 #define STEEM_MAX_URL_LENGTH                  127
 
 #define STEEM_IRREVERSIBLE_THRESHOLD          (75 * STEEM_1_PERCENT)
+/** Irreversibility only counts blocks produced if wit.current_run >= STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN */
+#define STEEM_IRREVERSIBLE_SUPPORT_MIN_RUN    2
 
 #define STEEM_VIRTUAL_SCHEDULE_LAP_LENGTH  ( fc::uint128(uint64_t(-1)) )
 #define STEEM_VIRTUAL_SCHEDULE_LAP_LENGTH2 ( fc::uint128::max_value() )