diff --git a/src/calibre/ebooks/lrf/__init__.py b/src/calibre/ebooks/lrf/__init__.py
index cb7eae9067..7c195f96e4 100644
--- a/src/calibre/ebooks/lrf/__init__.py
+++ b/src/calibre/ebooks/lrf/__init__.py
@@ -76,14 +76,14 @@ def option_parser(usage, gui_mode=False):
                     dest="author", help=_("Set the author(s). Multiple authors should be set as a comma separated list. Default: %default"), 
                     default=_('Unknown'))
     metadata.add_option("--comment", action="store", type="string", \
-                    dest="freetext", help=_("Set the comment."), default='Unknown')
+                    dest="freetext", help=_("Set the comment."), default=_('Unknown'))
     metadata.add_option("--category", action="store", type="string", \
-                    dest="category", help=_("Set the category"), default='Unknown')    
+                    dest="category", help=_("Set the category"), default=_('Unknown'))    
     metadata.add_option('--title-sort', action='store', default='', dest='title_sort',
                       help=_('Sort key for the title'))
     metadata.add_option('--author-sort', action='store', default='', dest='author_sort',
                       help=_('Sort key for the author'))
-    metadata.add_option('--publisher', action='store', default='Unknown', dest='publisher',
+    metadata.add_option('--publisher', action='store', default=_('Unknown'), dest='publisher',
                       help=_('Publisher'))
     metadata.add_option('--cover', action='store', dest='cover', default=None, \
                         help=_('Path to file containing image to be used as cover'))
diff --git a/src/calibre/ebooks/lrf/fb2/convert_from.py b/src/calibre/ebooks/lrf/fb2/convert_from.py
index dde1ce78e0..dc4644d292 100644
--- a/src/calibre/ebooks/lrf/fb2/convert_from.py
+++ b/src/calibre/ebooks/lrf/fb2/convert_from.py
@@ -92,13 +92,13 @@ def process_file(path, options, logger=None):
         options.output = os.path.abspath(os.path.expanduser(options.output))
         if not mi.title:
             mi.title = os.path.splitext(os.path.basename(fb2))[0]
-        if (not options.title or options.title == 'Unknown'):
+        if (not options.title or options.title == _('Unknown')):
             options.title = mi.title
-        if (not options.author or options.author == 'Unknown') and mi.authors:
+        if (not options.author or options.author == _('Unknown')) and mi.authors:
             options.author = mi.authors.pop()
-        if (not options.category or options.category == 'Unknown') and mi.category:
+        if (not options.category or options.category == _('Unknown')) and mi.category:
             options.category = mi.category
-        if (not options.freetext or options.freetext == 'Unknown') and mi.comments:
+        if (not options.freetext or options.freetext == _('Unknown')) and mi.comments:
             options.freetext = mi.comments
         os.chdir(tdir)
         html_process_file(htmlfile, options, logger)