diff --git a/electrum/gui/kivy/uix/dialogs/tx_dialog.py b/electrum/gui/kivy/uix/dialogs/tx_dialog.py
index 8c46c12ac..c10a9aac8 100644
--- a/electrum/gui/kivy/uix/dialogs/tx_dialog.py
+++ b/electrum/gui/kivy/uix/dialogs/tx_dialog.py
@@ -279,7 +279,7 @@ class TxDialog(Factory.Popup):
         if fee is None:
             return  # fee left empty, treat is as "cancel"
         if fee > max_fee:
-            self.show_error(_('Max fee exceeded'))
+            self.app.show_error(_('Max fee exceeded'))
             return
         try:
             new_tx = self.wallet.cpfp(parent_tx, fee)