diff --git a/plugins/trezor/plugin.py b/plugins/trezor/plugin.py
index a0cebc33b..02f4817ec 100644
--- a/plugins/trezor/plugin.py
+++ b/plugins/trezor/plugin.py
@@ -36,7 +36,7 @@ class TrezorCompatibleWallet(BIP44_Wallet):
         return False
 
     def is_watching_only(self):
-        return self.checked_device and not self.proper_device
+        return not self.proper_device
 
     def can_change_password(self):
         return False