diff --git a/action.yml b/action.yml
index 149d250..fbe0e85 100644
--- a/action.yml
+++ b/action.yml
@@ -53,7 +53,7 @@ runs:
       id: get_installation_token
       with:
         app_id: ${{ inputs.app_id }}
-        app_private_key: ${{ inputs.app_private_key }}
+        private_key: ${{ inputs.app_private_key }}
 
     - name: Find associated pull request
       id: pr