diff --git a/esphome/components/prometheus/prometheus_handler.cpp b/esphome/components/prometheus/prometheus_handler.cpp
index fa7b4fe132..618c866d5b 100644
--- a/esphome/components/prometheus/prometheus_handler.cpp
+++ b/esphome/components/prometheus/prometheus_handler.cpp
@@ -7,7 +7,7 @@ namespace esphome {
 namespace prometheus {
 
 void PrometheusHandler::handleRequest(AsyncWebServerRequest *req) {
-  AsyncResponseStream *stream = req->beginResponseStream("text/plain");
+  AsyncResponseStream *stream = req->beginResponseStream("text/plain; version=0.0.4; charset=utf-8");
 
 #ifdef USE_SENSOR
   this->sensor_type_(stream);