diff --git a/src/calibre/gui2/tweak_book/editor/smarts/python.py b/src/calibre/gui2/tweak_book/editor/smarts/python.py
index 3dc97a0e79..6271a76203 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/python.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/python.py
@@ -15,7 +15,7 @@ from calibre.gui2.tweak_book.editor.smarts import NullSmarts
 def get_text_before_cursor(editor):
     cursor = editor.textCursor()
     cursor.clearSelection()
-    cursor.movePosition(cursor.StartOfLine, cursor.KeepAnchor)
+    cursor.movePosition(cursor.StartOfBlock, cursor.KeepAnchor)
     text = cursor.selectedText()
     return cursor, text