diff --git a/src/calibre/gui2/widgets.py b/src/calibre/gui2/widgets.py
index dc57fc8004..2e2dae3b44 100644
--- a/src/calibre/gui2/widgets.py
+++ b/src/calibre/gui2/widgets.py
@@ -107,7 +107,7 @@ class FilenamePattern(QWidget, Ui_Form):  # {{{
         ext = os.path.splitext(fname)[1][1:].lower()
         if ext not in BOOK_EXTENSIONS:
             return warning_dialog(self, _('Test name invalid'),
-                    _('The name <b>%r</b> does not appear to end with a'
+                    _('The name <b>%s</b> does not appear to end with a'
                         ' file extension. The name must end with a file '
                         ' extension like .epub or .mobi')%fname, show=True)