diff --git a/core/tests/test_apps.bitcoin.txweight.py b/core/tests/test_apps.bitcoin.txweight.py
index e864dc98d..14e0ab2b3 100644
--- a/core/tests/test_apps.bitcoin.txweight.py
+++ b/core/tests/test_apps.bitcoin.txweight.py
@@ -1,11 +1,15 @@
 from common import *
 
+from trezor.messages import MultisigRedeemScriptType
 from trezor.messages import TxInput
 from trezor.messages import TxOutput
+from trezor.messages import HDNodeType
 from trezor.enums import OutputScriptType
-from trezor.crypto import bip32, bip39
+from trezor.crypto import bip39
 
 from apps.common import coins
+from apps.common.keychain import Keychain
+from apps.common.paths import AlwaysMatchingSchema
 from apps.bitcoin.sign_tx.tx_weight import *
 from apps.bitcoin.scripts import output_derive_script
 
@@ -16,7 +20,6 @@ class TestCalculateTxWeight(unittest.TestCase):
     def test_p2pkh_txweight(self):
 
         coin = coins.by_name('Bitcoin')
-        seed = bip39.seed(' '.join(['all'] * 12), '')
 
         inp1 = TxInput(address_n=[0],  # 14LmW5k4ssUrtbAB4255zdqv3b4w1TuX9e
                            # amount=390000,
@@ -44,7 +47,6 @@ class TestCalculateTxWeight(unittest.TestCase):
     def test_p2wpkh_in_p2sh_txweight(self):
 
         coin = coins.by_name('Testnet')
-        seed = bip39.seed(' '.join(['all'] * 12), '')
 
         inp1 = TxInput(
             # 49'/1'/0'/1/0" - 2N1LGaGg836mqSQqiuUBLfcyGBhyZbremDX
@@ -84,7 +86,6 @@ class TestCalculateTxWeight(unittest.TestCase):
     def test_native_p2wpkh_txweight(self):
 
         coin = coins.by_name('Testnet')
-        seed = bip39.seed(' '.join(['all'] * 12), '')
 
         inp1 = TxInput(
             # 49'/1'/0'/0/0" - tb1qqzv60m9ajw8drqulta4ld4gfx0rdh82un5s65s
@@ -121,6 +122,90 @@ class TestCalculateTxWeight(unittest.TestCase):
         # segwit: segwit header, witness stack item count, witness 1*(2+1+107) = 110
         # total 566
 
+    def test_legacy_multisig_txweight(self):
+        coin = coins.by_name('Bitcoin')
+        seed = bip39.seed(' '.join(['all'] * 12), '')
+        keychain = Keychain(seed, coin.curve_name, [AlwaysMatchingSchema])
+
+        nodes = []
+        for index in range(1, 4):
+            node = keychain.derive([48 | 0x80000000, 0 | 0x80000000, index | 0x80000000, 0 | 0x80000000])
+            nodes.append(HDNodeType(
+                depth=node.depth(),
+                child_num=node.child_num(),
+                fingerprint=node.fingerprint(),
+                chain_code=node.chain_code(),
+                public_key=node.public_key(),
+            ))
+
+        multisig = MultisigRedeemScriptType(
+            nodes=nodes, address_n=[0, 0], signatures=[b"", b"", b""], m=2
+        )
+
+        inp1 = TxInput(
+            address_n=[48 | 0x80000000, 0 | 0x80000000, 1 | 0x80000000, 0, 0],
+            amount=100000,
+            prev_hash=unhexlify('c6091adf4c0c23982a35899a6e58ae11e703eacd7954f588ed4b9cdefc4dba52'),
+            prev_index=1,
+            script_type=InputScriptType.SPENDMULTISIG,
+            multisig=multisig,
+        )
+
+        out1 = TxOutput(
+            address="12iyMbUb4R2K3gre4dHSrbu5azG5KaqVss",
+            amount=100000,
+            script_type=OutputScriptType.PAYTOADDRESS,
+        )
+
+        calculator = TxWeightCalculator()
+        calculator.add_input(inp1)
+        calculator.add_output(output_derive_script(out1.address, coin))
+
+        # 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
+        self.assertEqual(calculator.get_total(), 4*341)
+
+    def test_segwit_multisig_txweight(self):
+        coin = coins.by_name('Testnet')
+        seed = bip39.seed(' '.join(['all'] * 12), '')
+        keychain = Keychain(seed, coin.curve_name, [AlwaysMatchingSchema])
+
+        nodes = []
+        for index in range(1, 4):
+            node = keychain.derive([49 | 0x80000000, 1 | 0x80000000, index | 0x80000000])
+            nodes.append(HDNodeType(
+                depth=node.depth(),
+                child_num=node.child_num(),
+                fingerprint=node.fingerprint(),
+                chain_code=node.chain_code(),
+                public_key=node.public_key(),
+            ))
+
+        multisig = MultisigRedeemScriptType(
+            nodes=nodes, address_n=[0, 0], signatures=[b"", b"", b""], m=2
+        )
+
+        inp1 = TxInput(
+            address_n=[49 | 0x80000000, 1 | 0x80000000, 1 | 0x80000000, 0, 0],
+            prev_hash=unhexlify('c9348040bbc2024e12dcb4a0b4806b0398646b91acf314da028c3f03dd0179fc'),
+            prev_index=1,
+            script_type=InputScriptType.SPENDP2SHWITNESS,
+            multisig=multisig,
+            amount=1610436,
+        )
+
+        out1 = TxOutput(
+            address="tb1qch62pf820spe9mlq49ns5uexfnl6jzcezp7d328fw58lj0rhlhasge9hzy",
+            amount=1605000,
+            script_type=OutputScriptType.PAYTOADDRESS,
+        )
+
+        calculator = TxWeightCalculator()
+        calculator.add_input(inp1)
+        calculator.add_output(output_derive_script(out1.address, coin))
+
+        # 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
+        self.assertEqual(calculator.get_total(), 4*129 + 256)
+
 
 if __name__ == '__main__':
     unittest.main()