diff --git a/trezorlib/client.py b/trezorlib/client.py
index 2d62db6a1..dbb4c5424 100644
--- a/trezorlib/client.py
+++ b/trezorlib/client.py
@@ -337,6 +337,7 @@ class DebugLinkMixin(object):
 
 class ProtocolMixin(object):
     PRIME_DERIVATION_FLAG = 0x80000000
+    VENDORS = ('bitcointrezor.com',)
 
     def __init__(self, *args, **kwargs):
         super(ProtocolMixin, self).__init__(*args, **kwargs)
@@ -348,6 +349,8 @@ class ProtocolMixin(object):
 
     def init_device(self):
         self.features = expect(proto.Features)(self.call)(proto.Initialize())
+        if str(self.features.vendor) not in self.VENDORS:
+            raise Exception("Unsupported device")
 
     def _get_local_entropy(self):
         return os.urandom(32)