diff --git a/caller_workflows/assign_pr_to_project.yml b/caller_workflows/assign_pr_to_project.yml
index ff82382..14e1a02 100644
--- a/caller_workflows/assign_pr_to_project.yml
+++ b/caller_workflows/assign_pr_to_project.yml
@@ -21,7 +21,7 @@ jobs:
     uses: ynput/ops-repo-automation/.github/workflows/pr_to_project.yml@main
     with:
       repo: "${{ github.repository }}"
-      project_id: ${{ inputs.project_id }}
-      pull_request_number: ${{ github.event.pull_request.number || inputs.pr_number }}
+      project_id: "${{ inputs.project_id }}"
+      pull_request_number: "${{ github.event.pull_request.number || inputs.pr_number }}"
     secrets:
       token: ${{ secrets.YNPUT_BOT_TOKEN }}