diff --git a/src/cryptonote_core/tx_pool.cpp b/src/cryptonote_core/tx_pool.cpp
index ebf170c8..515918cf 100644
--- a/src/cryptonote_core/tx_pool.cpp
+++ b/src/cryptonote_core/tx_pool.cpp
@@ -107,6 +107,9 @@ namespace cryptonote
   //---------------------------------------------------------------------------------
   bool tx_memory_pool::add_tx(transaction &tx, /*const crypto::hash& tx_prefix_hash,*/ const crypto::hash &id, size_t blob_size, tx_verification_context& tvc, bool kept_by_block, bool relayed, bool do_not_relay, uint8_t version)
   {
+    // this should already be called with that lock, but let's make it explicit for clarity
+    CRITICAL_REGION_LOCAL(m_transactions_lock);
+
     PERF_TIMER(add_tx);
     if (tx.version == 0)
     {
@@ -224,6 +227,7 @@ namespace cryptonote
         meta.do_not_relay = do_not_relay;
         try
         {
+          CRITICAL_REGION_LOCAL1(m_blockchain);
           LockedTXN lock(m_blockchain);
           m_blockchain.add_txpool_tx(tx, meta);
           if (!insert_key_images(tx, kept_by_block))
@@ -260,6 +264,7 @@ namespace cryptonote
 
       try
       {
+        CRITICAL_REGION_LOCAL1(m_blockchain);
         LockedTXN lock(m_blockchain);
         m_blockchain.remove_txpool_tx(get_transaction_hash(tx));
         m_blockchain.add_txpool_tx(tx, meta);