diff --git a/src/plugins/utils/tone.py b/src/plugins/utils/tone.py
index e484d97..8b12614 100644
--- a/src/plugins/utils/tone.py
+++ b/src/plugins/utils/tone.py
@@ -84,7 +84,7 @@
             "documents": [
               {
                 "language": "en",
-                "id": uuid.uuid4(),
+                "id": str(uuid.uuid4()),
                 "text": body
               }
             ]