diff --git a/src/Utils/Message.hs b/src/Utils/Message.hs
index 2d819bc32..7cf7f653f 100644
--- a/src/Utils/Message.hs
+++ b/src/Utils/Message.hs
@@ -38,7 +38,7 @@ deriveJSON defaultOptions
 nullaryPathPiece ''MessageClass camelToPathPiece
 derivePersistField "MessageClass"
 
-data UnknownMessageClass = UnknownMessageClass !Text
+newtype UnknownMessageClass = UnknownMessageClass Text
   deriving (Eq, Ord, Read, Show, Generic, Typeable)
 
 instance Exception UnknownMessageClass