diff --git a/src/Node.Worker.Parent.purs b/src/Node.Worker.Parent.purs
index bf1378b..9c46288 100644
--- a/src/Node.Worker.Parent.purs
+++ b/src/Node.Worker.Parent.purs
@@ -114,12 +114,12 @@ emptySpawnOptions =
 spawnOptionsToImpl :: forall a. Serializable a => Record (SpawnOptions (workerData :: Maybe a, eval :: Boolean)) -> Record SpawnImplOptions
 spawnOptionsToImpl =
   let
-    mapEnv (Just InheritEnv) = Nullable.notNull $ unsafeToForeign shareEnv
+    mapEnv (Just InheritEnv) = Nullable.notNull $ (unsafeToForeign :: Symbol -> Foreign) shareEnv
     mapEnv (Just (FixedEnv env)) = Nullable.notNull $ serialize $ Object.fromFoldableWithIndex env
     mapEnv Nothing = Nullable.null
   in
     applyRecord
-      { argv: Nullable.toNullable <<< map (map unsafeToForeign)
+      { argv: Nullable.toNullable <<< map (map serialize)
       , env: mapEnv
       , eval: Nullable.notNull
       , execArgv: Nullable.toNullable
diff --git a/src/Node.Worker.Serializable.purs b/src/Node.Worker.Serializable.purs
index 7cf8afc..ffc06d3 100644
--- a/src/Node.Worker.Serializable.purs
+++ b/src/Node.Worker.Serializable.purs
@@ -25,6 +25,9 @@ import Type.Prelude (Proxy(..))
 
 foreign import undef :: Foreign
 
+convert :: forall @a. a -> Foreign
+convert = unsafeToForeign
+
 class Serializable a where
   serialize :: a -> Foreign
   deserialize :: Foreign -> Either String a
@@ -34,44 +37,44 @@ instance Serializable Foreign where
   deserialize = pure
 
 instance Serializable String where
-  serialize = unsafeToForeign
+  serialize = convert @String
   deserialize = lmap show <<< runExcept <<< readString
 
 instance Serializable URL where
-  serialize = unsafeToForeign
+  serialize = convert @URL
   deserialize = lmap show <<< runExcept <<< unsafeReadTagged "URL"
 
 instance Serializable Int where
-  serialize = unsafeToForeign
+  serialize = convert @Int
   deserialize = lmap show <<< runExcept <<< readInt
 
 instance Serializable Number where
-  serialize = unsafeToForeign
+  serialize = convert @Number
   deserialize = lmap show <<< runExcept <<< readNumber
 
 instance Serializable BigInt where
-  serialize = unsafeToForeign
+  serialize = convert @BigInt
   deserialize = lmap show <<< runExcept <<< unsafeReadTagged "BigInt"
 
 instance Serializable Boolean where
-  serialize = unsafeToForeign
+  serialize = convert @Boolean
   deserialize = lmap show <<< runExcept <<< readBoolean
 
 instance Serializable a => Serializable (Maybe a) where
-  serialize (Just a) = unsafeToForeign a
+  serialize (Just a) = convert @a a
   serialize Nothing = undef
   deserialize = flip bind (traverse deserialize) <<< lmap show <<< runExcept <<< readNullOrUndefined
 
 instance Serializable a => Serializable (Array a) where
-  serialize a = unsafeToForeign a
+  serialize a = convert @(Array a) a
   deserialize = flip bind (traverse deserialize) <<< lmap show <<< runExcept <<< readArray
 
 instance Serializable a => Serializable (NonEmptyArray a) where
-  serialize a = unsafeToForeign $ Array.NonEmpty.toArray a
+  serialize a = convert @(Array a) $ Array.NonEmpty.toArray a
   deserialize = flip bind (liftMaybe "expected non-empty array" <<< Array.NonEmpty.fromArray) <<< deserialize
 
 instance Serializable a => Serializable (Object a) where
-  serialize a = unsafeToForeign a
+  serialize a = convert @(Object a) a
   deserialize a =
     if typeOf a == "object" then
       pure $ unsafeFromForeign a
@@ -79,7 +82,7 @@ instance Serializable a => Serializable (Object a) where
       throwError $ "expected object, found " <> typeOf a
 
 instance (RowToList r rl, SerializeRecord rl r () to, DeserializeRecord rl () r) => Serializable (Record r) where
-  serialize a = unsafeToForeign $ serializeFields (Proxy @rl) a
+  serialize a = convert @(Record to) $ Record.Builder.buildFromScratch $ serializeFields (Proxy @rl) a
   deserialize a = map (flip Record.Builder.build {}) (deserializeFields (Proxy @rl) a)
 
 class DeserializeRecord (rl :: RowList Type) (from :: Row Type) (to :: Row Type) | rl -> from to where