diff --git a/src/main/kotlin/com/aitrainer/api/controller/OpenAIController.kt b/src/main/kotlin/com/aitrainer/api/controller/OpenAIController.kt
index 869e3e5..0fcd29c 100644
--- a/src/main/kotlin/com/aitrainer/api/controller/OpenAIController.kt
+++ b/src/main/kotlin/com/aitrainer/api/controller/OpenAIController.kt
@@ -45,7 +45,7 @@ class OpenAIController() {
     }
 
     @OptIn(BetaOpenAI::class, DelicateCoroutinesApi::class)
-    @PostMapping("/openai/chat_completion")
+    @PostMapping("/openai/chat_completion", produces = [org.springframework.http.MediaType.APPLICATION_JSON_VALUE + ";charset=UTF-8"])
     fun getOpenAIChatCompletion(@RequestBody openai: OpenAIChat, @Value("\${openai.key}") openaiKey: String, ) : String {
         var result: String
         val openAIService = OpenAIService(openaiKey, openai.modelName, openai.temperature)