diff --git a/testchain/address.py b/testchain/address.py
index aa771cc..03458c3 100644
--- a/testchain/address.py
+++ b/testchain/address.py
@@ -37,7 +37,7 @@ def __init__(self, key: CBitcoinSecret, address_type: str = "p2pkh"):
             self.address = P2WSHBitcoinAddress.from_scriptPubKey(script_pub_key)
         else:
             raise UnsupportedAddressTypeError()
-        self.value = 0
+        self.value = 0.0
         self.txid = None
         self.vout = None
 
diff --git a/testchain/runner.py b/testchain/runner.py
index 2c22a41..9fa6a5a 100644
--- a/testchain/runner.py
+++ b/testchain/runner.py
@@ -34,6 +34,7 @@ def __init__(self, output_dir, chain, executable):
         self._setup_chain_params()
         self._setup_bitcoind()
         self.proxy = bitcointx.rpc.Proxy(btc_conf_file=self.conf_file)
+        self.proxy.call("createwallet", os.path.join(self.tempdir.name, "testwallet"))
         self.proxy.call("importprivkey", COINBASE_KEY)
 
     def _setup_logger(self):