diff --git a/flatbuffers-parser.cabal b/flatbuffers-parser.cabal
--- a/flatbuffers-parser.cabal
+++ b/flatbuffers-parser.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.4
 name:               flatbuffers-parser
-version:            0.1.1.0
+version:            0.2.0.0
 synopsis:           Parse flatbuffers
 license:            BSD-3-Clause
 license-file:       LICENSE
diff --git a/src/Flatbuffers/Parser.hs b/src/Flatbuffers/Parser.hs
--- a/src/Flatbuffers/Parser.hs
+++ b/src/Flatbuffers/Parser.hs
@@ -112,7 +112,7 @@
   | ExpectedWord8EqButGot !Word8 !Word8
   | ExpectedWord16EqButGot !Word16 !Word16
   | MissingFieldWithIndex !Int
-  | UnsupportedUnionTag
+  | UnsupportedUnionTag !Word8
   deriving (Show)
 
 type Parser :: Type -> Type