diff --git a/trezorlib/client.py b/trezorlib/client.py
index e8cc4d67a0..d7fdaae064 100644
--- a/trezorlib/client.py
+++ b/trezorlib/client.py
@@ -523,6 +523,11 @@ class ProtocolMixin(object):
             data, chunk = data[data_length:], data[:data_length]
             response = self.call(proto.EthereumTxAck(data_chunk=chunk))
 
+        # https://github.com/trezor/trezor-mcu/pull/399
+        # only signature bit returned. recalculate signature_v
+        if response.signature_v <= 1:
+            response.signature_v += 2 * chain_id + 35
+
         return response.signature_v, response.signature_r, response.signature_s
 
     @expect(proto.EthereumMessageSignature)
diff --git a/trezorlib/tests/device_tests/test_msg_ethereum_signtx_eip155.py b/trezorlib/tests/device_tests/test_msg_ethereum_signtx_eip155.py
index d34bd82ad3..9e156a4be5 100644
--- a/trezorlib/tests/device_tests/test_msg_ethereum_signtx_eip155.py
+++ b/trezorlib/tests/device_tests/test_msg_ethereum_signtx_eip155.py
@@ -157,6 +157,46 @@ class TestMsgEthereumSigntxChainId(TrezorTest):
                 21004,
                 b"\0",
             ),
+            (
+                2147483630,
+                1,
+                4294967295,
+                b"fd0377ff429a51ae284c4b09b7d7c26c78944c86bb311b5988d70be4fc59eeba",
+                b"2ad183858ac6b1efa820b9ee2c2dbf6659a73cc5b714d32c380b263d024f2ee9",
+                0,
+                21004,
+                None,
+            ),
+            (
+                2147483631,
+                1,
+                4294967298,
+                b"a4e89720285b179f679ecec1c79e4948b18ee4cf08f76b11d701cbead5e81a70",
+                b"094b32d3e53833c8085dadfe169782db4d32856d7b556f832f64dfdcfa1dd3b8",
+                100000000000000000,
+                21000,
+                None,
+            ),
+            (
+                3125659152,
+                1,
+                6251318340,
+                b"a39e51d16cb10c81a9c1d9b071b714c4ecf112702407f1cc7aae35c85eced3d3",
+                b"0b0654665e4677c77510fc2a43026ee66c13261d3d893895bc49e6f4eaa5c8bd",
+                1,
+                21005,
+                None,
+            ),
+            (
+                4294967295,
+                1,
+                8589934625,
+                b"3367230b5f506426f075f3137f4fd6a5fc4198326dd4936bbc38bf0c5ff43a5e",
+                b"6e48c3c95b3a534f7853a3b5dd72cdeffe9b7e93503eb7a793c9d5fdc14c4e99",
+                100000000000000000,
+                21000,
+                None,
+            ),
         ]
 
         self.setup_mnemonic_allallall()