diff --git a/homeassistant/components/html5/notify.py b/homeassistant/components/html5/notify.py
index 6970ebbedb4..c07cddb7a9c 100644
--- a/homeassistant/components/html5/notify.py
+++ b/homeassistant/components/html5/notify.py
@@ -242,7 +242,9 @@ class HTML5PushRegistrationView(HomeAssistantView):
         try:
             hass = request.app["hass"]
 
-            await hass.async_add_job(save_json, self.json_path, self.registrations)
+            await hass.async_add_executor_job(
+                save_json, self.json_path, self.registrations
+            )
             return self.json_message("Push notification subscriber registered.")
         except HomeAssistantError:
             if previous_registration is not None:
@@ -288,7 +290,9 @@ class HTML5PushRegistrationView(HomeAssistantView):
         try:
             hass = request.app["hass"]
 
-            await hass.async_add_job(save_json, self.json_path, self.registrations)
+            await hass.async_add_executor_job(
+                save_json, self.json_path, self.registrations
+            )
         except HomeAssistantError:
             self.registrations[found] = reg
             return self.json_message(