--- a/eric6/QScintilla/Editor.py	Sun Apr 05 16:19:12 2020 +0200
+++ b/eric6/QScintilla/Editor.py	Sun Apr 05 18:17:08 2020 +0200
@@ -3150,7 +3150,7 @@
             txt = self.text()
             txtExpanded = txt.expandtabs(self.__getEditorConfig("TabWidth"))
             if txtExpanded != txt:
-                self.beginUndoAction
+                self.beginUndoAction()
                 self.setText(txt)
                 self.endUndoAction()