diff --git a/tests/common.py b/tests/common.py
index bd2fe14..e318865 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -10,6 +10,7 @@ class TrezorTest(unittest.TestCase):
         self.transport = config.TRANSPORT(*config.TRANSPORT_ARGS, **config.TRANSPORT_KWARGS)
         self.client = TrezorDebugClient(self.transport)
         self.client.set_debuglink(self.debug_transport)
+        self.client.set_tx_api(TXAPIBitcoin())
         # self.client.set_buttonwait(3)
 
         #                     1      2     3    4      5      6      7     8      9    10    11    12
diff --git a/tests/test_msg_signtx.py b/tests/test_msg_signtx.py
index 58d3f40..6b9a859 100644
--- a/tests/test_msg_signtx.py
+++ b/tests/test_msg_signtx.py
@@ -6,7 +6,7 @@ import itertools
 import trezorlib.messages_pb2 as proto
 import trezorlib.types_pb2 as proto_types
 from trezorlib.client import CallException
-from trezorlib.tx_api import TXAPITestnet, TXAPIBitcoin
+from trezorlib.tx_api import TXAPITestnet
 
 class TestMsgSigntx(common.TrezorTest):
     def test_one_one_fee(self):
@@ -476,7 +476,6 @@ class TestMsgSigntx(common.TrezorTest):
                               )
 
         with self.client:
-            self.client.set_tx_api(TXAPIBitcoin())
             self.client.set_expected_responses([
                 proto.TxRequest(request_type=proto_types.TXINPUT, details=proto_types.TxRequestDetailsType(request_index=0)),
                 proto.TxRequest(request_type=proto_types.TXMETA, details=proto_types.TxRequestDetailsType(tx_hash=binascii.unhexlify("54aa5680dea781f45ebb536e53dffc526d68c0eb5c00547e323b2c32382dfba3"))),
diff --git a/tests/test_msg_simplesigntx.py b/tests/test_msg_simplesigntx.py
index c94a357..82efd57 100644
--- a/tests/test_msg_simplesigntx.py
+++ b/tests/test_msg_simplesigntx.py
@@ -8,7 +8,7 @@ import binascii
 import trezorlib.messages_pb2 as proto
 import trezorlib.types_pb2 as proto_types
 from trezorlib.client import CallException
-from trezorlib.tx_api import TXAPITestnet, TXAPIBitcoin
+from trezorlib.tx_api import TXAPITestnet
 
 class TestMsgSimplesigntx(common.TrezorTest):
 
@@ -320,7 +320,6 @@ class TestMsgSimplesigntx(common.TrezorTest):
                               )
 
         with self.client:
-            self.client.set_tx_api(TXAPIBitcoin())
             self.client.set_expected_responses([proto.ButtonRequest(code=proto_types.ButtonRequest_ConfirmOutput),
                                                 proto.ButtonRequest(code=proto_types.ButtonRequest_SignTx),
                                                 proto.TxRequest(request_type=proto_types.TXFINISHED)])
diff --git a/tests/test_op_return.py b/tests/test_op_return.py
index c36d7bd..886a3f7 100644
--- a/tests/test_op_return.py
+++ b/tests/test_op_return.py
@@ -6,7 +6,7 @@ import itertools
 import trezorlib.messages_pb2 as proto
 import trezorlib.types_pb2 as proto_types
 from trezorlib.client import CallException
-from trezorlib.tx_api import TXAPITestnet, TXAPIBitcoin
+from trezorlib.tx_api import TXAPITestnet
 
 class TestOpReturn(common.TrezorTest):