diff --git a/tests/simulator/bitcoind_sim.py b/tests/simulator/bitcoind_sim.py
index 06cfeae..d9b902d 100644
--- a/tests/simulator/bitcoind_sim.py
+++ b/tests/simulator/bitcoind_sim.py
@@ -77,7 +77,7 @@ def process_request():
 
         if isinstance(txid, str):
             if check_txid_format(txid):
-                if txid not in mempool and txid not in list(mined_transactions.keys()):
+                if txid not in list(mined_transactions.keys()):
                     mempool.append(txid)
 
                 else:
@@ -100,6 +100,9 @@ def process_request():
             if block:
                 response["result"] = {"confirmations": len(blockchain) - block.get('height')}
 
+            elif txid in mempool:
+                response["result"] = {"confirmations": 0}
+
             else:
                 response["error"] = {'code': RPC_INVALID_ADDRESS_OR_KEY,
                                      'message': 'No such mempool or blockchain transaction. Use gettransaction for '