diff --git a/src/calibre/gui2/tweak_book/manage_fonts.py b/src/calibre/gui2/tweak_book/manage_fonts.py
index daf0a8676b..c7f653867b 100644
--- a/src/calibre/gui2/tweak_book/manage_fonts.py
+++ b/src/calibre/gui2/tweak_book/manage_fonts.py
@@ -11,7 +11,7 @@ import sys
 from PyQt4.Qt import (
     QSplitter, QVBoxLayout, QTableView, QWidget, QLabel, QAbstractTableModel,
     Qt, QApplication, QTimer, QPushButton, pyqtSignal, QFormLayout, QLineEdit,
-    QIcon)
+    QIcon, QSize)
 
 from calibre.ebooks.oeb.polish.container import get_container
 from calibre.ebooks.oeb.polish.fonts import font_family_data, change_font
@@ -198,6 +198,9 @@ class ManageFonts(Dialog):
 
         l.setAlignment(Qt.AlignTop | Qt.AlignHCenter)
 
+    def sizeHint(self):
+        return Dialog.sizeHint(self) + QSize(100, 50)
+
     def display(self):
         if not self.isVisible():
             self.show()