diff --git a/homeassistant/components/timer/services.yaml b/homeassistant/components/timer/services.yaml
index 37c989544e3..e17ea1dd5fb 100644
--- a/homeassistant/components/timer/services.yaml
+++ b/homeassistant/components/timer/services.yaml
@@ -9,7 +9,6 @@ start:
   fields:
     duration:
       description: Duration the timer requires to finish. [optional]
-      default: 0
       example: "00:01:00 or 60"
       selector:
         text: