diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 2f42e1db5..0f6afe740 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -948,7 +948,7 @@ bool Blockchain::prevalidate_miner_transaction(const block& b, uint64_t height)
 }
 //------------------------------------------------------------------
 // This function validates the miner transaction reward
-bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_block_size, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins, bool &partial_block_reward)
+bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_block_size, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins, bool &partial_block_reward, uint8_t version)
 {
   LOG_PRINT_L3("Blockchain::" << __func__);
   //validate reward
@@ -957,6 +957,15 @@ bool Blockchain::validate_miner_transaction(const block& b, size_t cumulative_bl
     money_in_use += o.amount;
   partial_block_reward = false;
 
+  if (version >= 3) {
+    for (auto &o: b.miner_tx.vout) {
+      if (!is_valid_decomposed_amount(o.amount)) {
+        LOG_PRINT_L1("miner tx output " << print_money(o.amount) << " is not a valid decomposed amount");
+        return false;
+      }
+    }
+  }
+
   std::vector<size_t> last_blocks_sizes;
   get_last_n_blocks_sizes(last_blocks_sizes, CRYPTONOTE_REWARD_BLOCKS_WINDOW);
   if (!get_block_reward(epee::misc_utils::median(last_blocks_sizes), cumulative_block_size, already_generated_coins, base_reward, get_current_hard_fork_version()))
@@ -2698,7 +2707,7 @@ leave:
   TIME_MEASURE_START(vmt);
   uint64_t base_reward = 0;
   uint64_t already_generated_coins = m_db->height() ? m_db->get_block_already_generated_coins(m_db->height() - 1) : 0;
-  if(!validate_miner_transaction(bl, cumulative_block_size, fee_summary, base_reward, already_generated_coins, bvc.m_partial_block_reward))
+  if(!validate_miner_transaction(bl, cumulative_block_size, fee_summary, base_reward, already_generated_coins, bvc.m_partial_block_reward, m_hardfork->get_current_version()))
   {
     LOG_PRINT_L1("Block with id: " << id << " has incorrect miner transaction");
     bvc.m_verifivation_failed = true;
diff --git a/src/cryptonote_core/blockchain.h b/src/cryptonote_core/blockchain.h
index 94def1aa9..393faef2a 100644
--- a/src/cryptonote_core/blockchain.h
+++ b/src/cryptonote_core/blockchain.h
@@ -980,10 +980,11 @@ namespace cryptonote
      * @param base_reward return-by-reference the new block's generated coins
      * @param already_generated_coins the amount of currency generated prior to this block
      * @param partial_block_reward return-by-reference true if miner accepted only partial reward
+     * @param version hard fork version for that transaction
      *
      * @return false if anything is found wrong with the miner transaction, otherwise true
      */
-    bool validate_miner_transaction(const block& b, size_t cumulative_block_size, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins, bool &partial_block_reward);
+    bool validate_miner_transaction(const block& b, size_t cumulative_block_size, uint64_t fee, uint64_t& base_reward, uint64_t already_generated_coins, bool &partial_block_reward, uint8_t version);
 
     /**
      * @brief reverts the blockchain to its previous state following a failed switch
diff --git a/src/cryptonote_core/cryptonote_format_utils.cpp b/src/cryptonote_core/cryptonote_format_utils.cpp
index 253e568b5..3c1acd8a9 100644
--- a/src/cryptonote_core/cryptonote_format_utils.cpp
+++ b/src/cryptonote_core/cryptonote_format_utils.cpp
@@ -126,20 +126,19 @@ namespace cryptonote
       return false;
     }
 
-    // from hard fork 2, we cut out the low significant digits. This makes the tx smaller, and
-    // keeps the paid amount almost the same. The unpaid remainder gets pushed back to the
-    // emission schedule
-    if (hard_fork_version >= 2)
-    {
-        block_reward = block_reward - block_reward % ::config::BASE_REWARD_CLAMP_THRESHOLD;
-    }
-
 #if defined(DEBUG_CREATE_BLOCK_TEMPLATE)
     LOG_PRINT_L1("Creating block template: reward " << block_reward <<
       ", fee " << fee)
 #endif
     block_reward += fee;
 
+    // from hard fork 2, we cut out the low significant digits. This makes the tx smaller, and
+    // keeps the paid amount almost the same. The unpaid remainder gets pushed back to the
+    // emission schedule
+    if (hard_fork_version >= 2) {
+      block_reward = block_reward - block_reward % ::config::BASE_REWARD_CLAMP_THRESHOLD;
+    }
+
     std::vector<uint64_t> out_amounts;
     decompose_amount_into_digits(block_reward, hard_fork_version >= 2 ? 0 : ::config::DEFAULT_DUST_THRESHOLD,
       [&out_amounts](uint64_t a_chunk) { out_amounts.push_back(a_chunk); },