diff --git a/src/calibre/gui2/tweak_book/editor/__init__.py b/src/calibre/gui2/tweak_book/editor/__init__.py
index 2ce54e4945..ab562d0bb4 100644
--- a/src/calibre/gui2/tweak_book/editor/__init__.py
+++ b/src/calibre/gui2/tweak_book/editor/__init__.py
@@ -6,7 +6,7 @@ from __future__ import (unicode_literals, division, absolute_import,
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 
-from PyQt4.Qt import QTextCharFormat
+from PyQt5.Qt import QTextCharFormat
 
 from calibre.ebooks.oeb.base import OEB_DOCS, OEB_STYLES
 from calibre.ebooks.oeb.polish.container import guess_type
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/html.py b/src/calibre/gui2/tweak_book/editor/syntax/html.py
index cca17bd0b3..a52ae14c76 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/html.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/html.py
@@ -567,7 +567,7 @@ class XMLHighlighter(HTMLHighlighter):
 
 def profile():
     import sys
-    from PyQt4.Qt import QTextDocument
+    from PyQt5.Qt import QTextDocument
     from calibre.gui2 import Application
     from calibre.gui2.tweak_book import set_book_locale
     from calibre.gui2.tweak_book.editor.themes import get_theme
diff --git a/src/calibre/gui2/tweak_book/editor/text.py b/src/calibre/gui2/tweak_book/editor/text.py
index 8eb17086cb..bd983ee9d3 100644
--- a/src/calibre/gui2/tweak_book/editor/text.py
+++ b/src/calibre/gui2/tweak_book/editor/text.py
@@ -582,8 +582,8 @@ class TextEdit(PlainTextEdit):
             formats = self.highlighter.parse_single_block(c.block())[0]
         pos = c.positionInBlock()
         for r in formats:
-            if r.start <= pos < r.start + r.length and r.format.property(SPELL_PROPERTY).toBool():
-                return r.format.property(SPELL_LOCALE_PROPERTY).toPyObject()
+            if r.start <= pos < r.start + r.length and r.format.property(SPELL_PROPERTY):
+                return r.format.property(SPELL_LOCALE_PROPERTY)
 
     def recheck_word(self, word, locale):
         c = self.textCursor()