diff --git a/electrum/gui/qt/main_window.py b/electrum/gui/qt/main_window.py
index 797355ed5..474ff563e 100644
--- a/electrum/gui/qt/main_window.py
+++ b/electrum/gui/qt/main_window.py
@@ -2241,6 +2241,7 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger):
             mpk_text.addCopyButton(self.app)
             def show_mpk(index):
                 mpk_text.setText(mpk_list[index])
+                mpk_text.repaint()  # macOS hack for #4777
             # only show the combobox in case multiple accounts are available
             if len(mpk_list) > 1:
                 def label(key):