diff --git a/avro.cabal b/avro.cabal
--- a/avro.cabal
+++ b/avro.cabal
@@ -1,7 +1,7 @@
 cabal-version: 2.4
 
 name:                   avro
-version:                0.6.1.0
+version:                0.6.1.1
 synopsis:               Avro serialization support for Haskell
 description:            Avro serialization and deserialization support for Haskell
 category:               Data
diff --git a/src/Data/Avro/Schema/ReadSchema.hs b/src/Data/Avro/Schema/ReadSchema.hs
--- a/src/Data/Avro/Schema/ReadSchema.hs
+++ b/src/Data/Avro/Schema/ReadSchema.hs
@@ -199,4 +199,5 @@
   f@Fixed{..}  -> HashMap.fromList $ (name : aliases) `zip` repeat f
   Array{..}    -> extractBindings item
   Map{..}      -> extractBindings values
+  FreeUnion {..} -> extractBindings ty
   _            -> HashMap.empty