diff --git a/setup/qt5-migrate.py b/setup/qt5-migrate.py
index 64126ed1e6..0d7582fcb2 100644
--- a/setup/qt5-migrate.py
+++ b/setup/qt5-migrate.py
@@ -14,6 +14,9 @@ __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
 
 # QT5XX: See if you can figure out why the splash screen does not work in linux
 
+# See why some dialog boxes are positioned in top left corner instead of center
+# on linux
+
 # QT5XX: Look for obsolete classes and functions from the list here:
 # http://qt-project.org/doc/qt-5/obsoleteclasses.html as these will not be
 # present in PyQt5
diff --git a/src/calibre/gui2/tweak_book/manage_fonts.py b/src/calibre/gui2/tweak_book/manage_fonts.py
index c7f653867b..d2e8c553a4 100644
--- a/src/calibre/gui2/tweak_book/manage_fonts.py
+++ b/src/calibre/gui2/tweak_book/manage_fonts.py
@@ -8,7 +8,7 @@ __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
 
 import sys
 
-from PyQt4.Qt import (
+from PyQt5.Qt import (
     QSplitter, QVBoxLayout, QTableView, QWidget, QLabel, QAbstractTableModel,
     Qt, QApplication, QTimer, QPushButton, pyqtSignal, QFormLayout, QLineEdit,
     QIcon, QSize)