diff --git a/homeassistant/components/prometheus/__init__.py b/homeassistant/components/prometheus/__init__.py
index 2159656f129..a0f0d69ce46 100644
--- a/homeassistant/components/prometheus/__init__.py
+++ b/homeassistant/components/prometheus/__init__.py
@@ -26,7 +26,7 @@ from homeassistant.components.cover import (
     ATTR_CURRENT_POSITION,
     ATTR_CURRENT_TILT_POSITION,
 )
-from homeassistant.components.http import HomeAssistantView
+from homeassistant.components.http import KEY_HASS, HomeAssistantView
 from homeassistant.components.humidifier import ATTR_AVAILABLE_MODES, ATTR_HUMIDITY
 from homeassistant.components.light import ATTR_BRIGHTNESS
 from homeassistant.components.sensor import SensorDeviceClass
@@ -729,7 +729,11 @@ class PrometheusView(HomeAssistantView):
         """Handle request for Prometheus metrics."""
         _LOGGER.debug("Received Prometheus metrics request")
 
+        hass = request.app[KEY_HASS]
+        body = await hass.async_add_executor_job(
+            prometheus_client.generate_latest, prometheus_client.REGISTRY
+        )
         return web.Response(
-            body=prometheus_client.generate_latest(prometheus_client.REGISTRY),
+            body=body,
             content_type=CONTENT_TYPE_TEXT_PLAIN,
         )