diff --git a/service/src/main/java/com/theokanning/openai/service/ChatFunctionCallArgumentsSerializerAndDeserializer.java b/service/src/main/java/com/theokanning/openai/service/ChatFunctionCallArgumentsSerializerAndDeserializer.java
index 9b7be0f9..ce81c508 100644
--- a/service/src/main/java/com/theokanning/openai/service/ChatFunctionCallArgumentsSerializerAndDeserializer.java
+++ b/service/src/main/java/com/theokanning/openai/service/ChatFunctionCallArgumentsSerializerAndDeserializer.java
@@ -44,6 +44,9 @@ public JsonNode deserialize(JsonParser p, DeserializationContext ctxt) throws IO
                 return null;
             }
 
+            // encode to valid JSON escape otherwise we will lose quotes
+            json = MAPPER.writeValueAsString(json);
+
             try {
                 JsonNode node = null;
                 try {