diff --git a/sphinx/application.py b/sphinx/application.py
index 95ca6279e..ba2940fa2 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -352,7 +352,8 @@ class Sphinx(object):
             elif key == 'text':
                 from sphinx.writers.text import TextTranslator as translator
             elif key == 'man':
-                from sphinx.writers.manpage import ManualPageTranslator as translator
+                from sphinx.writers.manpage import ManualPageTranslator \
+                    as translator
             else:
                 # ignore invalid keys for compatibility
                 continue