diff --git a/calibre-plugin/plugin-defaults.ini b/calibre-plugin/plugin-defaults.ini
index 8c72fba1..a5a913ad 100644
--- a/calibre-plugin/plugin-defaults.ini
+++ b/calibre-plugin/plugin-defaults.ini
@@ -818,6 +818,9 @@ add_to_replace_metadata:
 # Normalize 'fanfiction/fanfic/fan-fiction' a little.
  forumtags=>[Ff]an-?[Ff]ic(tion)?=>FanFiction
 
+# Remove [] from prefixtags ala [NSFW] on QQ
+ prefixtags=>[\[\]]+=>
+
 add_to_extra_titlepage_entries:,tagsfromtitle,forumtags
 
 ## XenForo tags are all lowercase everywhere that I've seen.  This
diff --git a/fanficfare/defaults.ini b/fanficfare/defaults.ini
index d9a40d12..f5df1891 100644
--- a/fanficfare/defaults.ini
+++ b/fanficfare/defaults.ini
@@ -810,6 +810,9 @@ add_to_replace_metadata:
 # Normalize 'fanfiction/fanfic/fan-fiction' a little.
  forumtags=>[Ff]an-?[Ff]ic(tion)?=>FanFiction
 
+# Remove [] from prefixtags ala [NSFW] on QQ
+ prefixtags=>[\[\]]+=>
+
 add_to_extra_titlepage_entries:,tagsfromtitle,forumtags
 
 ## XenForo tags are all lowercase everywhere that I've seen.  This