diff --git a/src/calibre/gui2/viewer/printing.py b/src/calibre/gui2/viewer/printing.py
index 637a74ec9e..97d08e094e 100644
--- a/src/calibre/gui2/viewer/printing.py
+++ b/src/calibre/gui2/viewer/printing.py
@@ -13,6 +13,7 @@ from PyQt5.Qt import (
     QFormLayout, QLineEdit, QToolButton, QHBoxLayout, QLabel, QIcon, QPrinter,
     QPageSize, QComboBox, QDoubleSpinBox, QCheckBox, QProgressDialog, QTimer)
 
+from calibre import sanitize_file_name2
 from calibre.ptempfile import PersistentTemporaryFile
 from calibre.ebooks.conversion.plugins.pdf_output import PAPER_SIZES
 from calibre.gui2 import elided_text, error_dialog, choose_save_file, Application, open_local_file, dynamic
@@ -28,7 +29,7 @@ class PrintDialog(Dialog):
 
     def __init__(self, book_title, parent=None, prefs=vprefs):
         self.book_title = book_title
-        self.default_file_name = book_title[:75] + '.pdf'
+        self.default_file_name = sanitize_file_name2(book_title[:75] + '.pdf')
         self.paper_size_map = {a:getattr(QPageSize, a.capitalize()) for a in PAPER_SIZES}
         Dialog.__init__(self, _('Print to PDF'), 'print-to-pdf', prefs=prefs, parent=parent)
 
@@ -86,8 +87,14 @@ class PrintDialog(Dialog):
 
     @property
     def data(self):
+        fpath = self.file_name.text().strip()
+        head, tail = os.path.split(fpath)
+        tail = sanitize_file_name2(tail)
+        fpath = tail
+        if head:
+            fpath = os.path.join(head, tail)
         ans = {
-            'output': self.file_name.text().strip(),
+            'output': fpath,
             'paper_size': self.paper_size.currentText().lower(),
             'page_numbers':self.pnum.isChecked(),
             'show_file':self.show_file.isChecked(),