diff --git a/.github/workflows/prepare_release.yml b/.github/workflows/prepare_release.yml
index 12e55d146..5aa417fe7 100644
--- a/.github/workflows/prepare_release.yml
+++ b/.github/workflows/prepare_release.yml
@@ -10,7 +10,6 @@ on:
       base-branch:
         description: 'The branch that will be used as the origin for the release branch.'
         required: false
-        type: string
         type: choice
         options:
           - main