diff --git a/src/apps/wallet/sign_tx/segwit_bip143.py b/src/apps/wallet/sign_tx/segwit_bip143.py
index e19d1a4e4..8168ce1b9 100644
--- a/src/apps/wallet/sign_tx/segwit_bip143.py
+++ b/src/apps/wallet/sign_tx/segwit_bip143.py
@@ -2,6 +2,7 @@ from trezor.crypto.hashlib import sha256
 from trezor.messages.SignTx import SignTx
 from trezor.messages import InputScriptType, FailureType
 
+from apps.wallet.sign_tx.writers import *
 
 class Bip143Error(ValueError):
     pass
diff --git a/src/apps/wallet/sign_tx/signing.py b/src/apps/wallet/sign_tx/signing.py
index 6e948456d..2106bf00b 100644
--- a/src/apps/wallet/sign_tx/signing.py
+++ b/src/apps/wallet/sign_tx/signing.py
@@ -14,6 +14,7 @@ from apps.common import coins
 from apps.wallet.sign_tx.segwit_bip143 import *
 from apps.wallet.sign_tx.helpers import *
 from apps.wallet.sign_tx.scripts import *
+from apps.wallet.sign_tx.writers import *
 
 # the number of bip32 levels used in a wallet (chain and address)
 _BIP32_WALLET_DEPTH = const(2)
diff --git a/src/apps/wallet/sign_tx/writers.py b/src/apps/wallet/sign_tx/writers.py
index 18eb757b9..2e4bd857f 100644
--- a/src/apps/wallet/sign_tx/writers.py
+++ b/src/apps/wallet/sign_tx/writers.py
@@ -1,9 +1,8 @@
-from micropython import const
 
-from trezor.messages.TxOutputBinType import TxOutputBinType
-from trezor.messages.TxInputType import TxInputType
 from trezor.crypto.hashlib import sha256
 
+from apps.wallet.sign_tx.writers import *
+
 # TX Serialization
 # ===