diff --git a/core/schema/openai.go b/core/schema/openai.go
index 23abd7b7..53dd5324 100644
--- a/core/schema/openai.go
+++ b/core/schema/openai.go
@@ -49,7 +49,7 @@ type OpenAIResponse struct {
 
 type Choice struct {
 	Index        int      `json:"index"`
-	FinishReason string   `json:"finish_reason,omitempty"`
+	FinishReason string   `json:"finish_reason"`
 	Message      *Message `json:"message,omitempty"`
 	Delta        *Message `json:"delta,omitempty"`
 	Text         string   `json:"text,omitempty"`