diff --git a/gui/qt/main_window.py b/gui/qt/main_window.py
index bfdb64732..b5276620b 100644
--- a/gui/qt/main_window.py
+++ b/gui/qt/main_window.py
@@ -1058,7 +1058,7 @@ class ElectrumWindow(QMainWindow):
             return
 
         # call hook to see if plugin needs gui interaction
-        run_hook('send_tx', tx, self.wallet)
+        run_hook('send_tx', tx)
 
         # sign the tx
         def sign_thread():
diff --git a/plugins/trezor.py b/plugins/trezor.py
index 7f9823e86..ecbdcbc0e 100644
--- a/plugins/trezor.py
+++ b/plugins/trezor.py
@@ -71,9 +71,9 @@ class Plugin(BasePlugin):
         wallet.create_accounts(None)
         return wallet
 
-    def send_tx(self, tx, wallet):
+    def send_tx(self, tx):
         try:
-            wallet.sign_transaction(tx, None, None)
+            self.wallet.sign_transaction(tx, None, None)
         except Exception as e:
             tx.error = str(e)