--- a/eric6/QScintilla/MiniEditor.py	Sun Mar 01 13:43:58 2020 +0100
+++ b/eric6/QScintilla/MiniEditor.py	Wed Mar 04 19:23:33 2020 +0100
@@ -2380,7 +2380,7 @@
             txt = self.__textEdit.text()
             txtExpanded = txt.expandtabs(self.__getEditorConfig("TabWidth"))
             if txtExpanded != txt:
-                self.__textEdit.beginUndoAction
+                self.__textEdit.beginUndoAction()
                 self.__textEdit.setText(txt)
                 self.__textEdit.endUndoAction()