diff --git a/utils/nitro_utils.h b/utils/nitro_utils.h
index c5dda96eb..aadeb9581 100644
--- a/utils/nitro_utils.h
+++ b/utils/nitro_utils.h
@@ -233,6 +233,7 @@ inline drogon::HttpResponsePtr nitroHttpJsonResponse(const Json::Value &data) {
   LOG_INFO << "Respond for all cors!";
   resp->addHeader("Access-Control-Allow-Origin", "*");
 #endif
+  resp->setContentTypeString("application/json");
   return resp;
 };