diff --git a/.github/workflows/json-build.yml b/.github/workflows/json-build.yml
index a1e5350b38..2494d1a4a8 100644
--- a/.github/workflows/json-build.yml
+++ b/.github/workflows/json-build.yml
@@ -16,6 +16,7 @@ on:
       custom_builder:
         description: "Custom Builder"
         required: false
+        type: string
         default: ""
   workflow_dispatch:
     inputs: