diff --git a/src/calibre/ebooks/lrf/__init__.py b/src/calibre/ebooks/lrf/__init__.py
index 2f9d724ce2..ae74e429ad 100644
--- a/src/calibre/ebooks/lrf/__init__.py
+++ b/src/calibre/ebooks/lrf/__init__.py
@@ -30,6 +30,7 @@ preferred_source_formats = [
                             'XHTML',
                             'PRC',
                             'AZW',
+                            'FB2',
                             'RTF',
                             'PDF',
                             'TXT',