diff --git a/api/src/main/java/com/theokanning/openai/completion/chat/ChatResponseFormat.java b/api/src/main/java/com/theokanning/openai/completion/chat/ChatResponseFormat.java
index 9ebf2b1..8922802 100644
--- a/api/src/main/java/com/theokanning/openai/completion/chat/ChatResponseFormat.java
+++ b/api/src/main/java/com/theokanning/openai/completion/chat/ChatResponseFormat.java
@@ -18,6 +18,7 @@
  * see {@link ChatCompletionRequest} documentation.
  */
 @Data
+@NoArgsConstructor
 public class ChatResponseFormat {
     /**
      * auto/text/json_object