diff --git a/source/library/Language/Haskell/Brittany/Internal/Components/Obfuscation.hs b/source/library/Language/Haskell/Brittany/Internal/Components/Obfuscation.hs
index 97dd0b2..291731c 100644
--- a/source/library/Language/Haskell/Brittany/Internal/Components/Obfuscation.hs
+++ b/source/library/Language/Haskell/Brittany/Internal/Components/Obfuscation.hs
@@ -64,6 +64,8 @@ keywords =
   , "proc"
   , "rec"
   , "family"
+  , "stock"
+  , "anyclass"
   ]
 
 extraKWs :: [String]