diff --git a/src/calibre/gui2/tweak_book/editor/text.py b/src/calibre/gui2/tweak_book/editor/text.py
index e9c90fc236..7f1129e5bc 100644
--- a/src/calibre/gui2/tweak_book/editor/text.py
+++ b/src/calibre/gui2/tweak_book/editor/text.py
@@ -544,8 +544,8 @@ class TextEdit(PlainTextEdit):
                 # characters
                 ev.key() == Qt.Key_X and ev.modifiers() == Qt.AltModifier
             ):
-                ev.ignore()
-                return False
+                ev.accept()
+                return True
         return QPlainTextEdit.event(self, ev)
 
     def text_for_range(self, block, r):