--- a/eric6/E5Gui/E5PlainTextDialog.py	Mon Mar 01 17:48:43 2021 +0100
+++ b/eric6/E5Gui/E5PlainTextDialog.py	Tue Mar 02 17:17:09 2021 +0100
@@ -33,7 +33,8 @@
         self.setupUi(self)
         
         self.copyButton = self.buttonBox.addButton(
-            self.tr("Copy to Clipboard"), QDialogButtonBox.ActionRole)
+            self.tr("Copy to Clipboard"),
+            QDialogButtonBox.ButtonRole.ActionRole)
         self.copyButton.clicked.connect(self.on_copyButton_clicked)
         
         self.setWindowTitle(title)