diff --git a/src/features/chat/chat-services/chat-api-data.ts b/src/features/chat/chat-services/chat-api-data.ts
index 8cd2481c3..33f3345fe 100644
--- a/src/features/chat/chat-services/chat-api-data.ts
+++ b/src/features/chat/chat-services/chat-api-data.ts
@@ -95,7 +95,9 @@ export const ChatAPIData = async (props: PromptGPTProps) => {
       },
     });
 
-    return new StreamingTextResponse(stream);
+    return new StreamingTextResponse(stream, {
+      headers: {"Content-Type": "text/event-stream"},
+    });
   } catch (e: unknown) {
     if (e instanceof Error) {
       return new Response(e.message, {
diff --git a/src/features/chat/chat-services/chat-api-simple.ts b/src/features/chat/chat-services/chat-api-simple.ts
index df855a1e3..4a80d628e 100644
--- a/src/features/chat/chat-services/chat-api-simple.ts
+++ b/src/features/chat/chat-services/chat-api-simple.ts
@@ -49,7 +49,9 @@ export const ChatAPISimple = async (props: PromptGPTProps) => {
         });
       },
     });
-    return new StreamingTextResponse(stream);
+    return new StreamingTextResponse(stream, {
+      headers: {"Content-Type": "text/event-stream"},
+    });
   } catch (e: unknown) {
     if (e instanceof Error) {
       return new Response(e.message, {