diff --git a/homeassistant/components/number/services.yaml b/homeassistant/components/number/services.yaml
index dcbb955d739..6a7083a7613 100644
--- a/homeassistant/components/number/services.yaml
+++ b/homeassistant/components/number/services.yaml
@@ -7,5 +7,6 @@ set_value:
   fields:
     value:
       example: 42
+      required: true
       selector:
         text: