diff --git a/.github/actions/render/action.yml b/.github/actions/render/action.yml
index e5bb8c7..7716066 100644
--- a/.github/actions/render/action.yml
+++ b/.github/actions/render/action.yml
@@ -52,7 +52,7 @@ runs:
         /usr/bin/build.sh
         --versioned_filenames
         $( [ -n "${{ inputs.pr-repo }}" -a -n "${{ inputs.pr-number }}" ]   && echo --pr_number=${{ inputs.pr-number }} --pr_repo=${{ inputs.pr-repo }} )
-        $( [ ${{ inputs.pdf }} -a -n "${{ inputs.diffbase }}" ]             && echo --diffbase=${{ inputs.diffbase }} --diffpdf=${diff_file_name}.pdf --diffpdflog=${diff_file_name}.pdf.log )
+        $( [ ${{ inputs.pdf }} -a -n "${{ inputs.diffbase }}" ]             && echo --diffbase=${{ inputs.diffbase }} --diffpdf=${{ inputs.output-basename }}.$(echo ${{ inputs.diffbase }} | cut -c1-20).diff.pdf --diffpdflog=${{ inputs.output-basename }}.$(echo ${{ inputs.diffbase }} | cut -c1-20).diff.pdf.log )
         $( ${{ inputs.pdf }}                                                && echo --pdf=${{ inputs.output-basename }}.pdf --pdflog=${{ inputs.output-basename }}.pdf.log )
         $( ${{ inputs.html }}                                               && echo --html=${{ inputs.output-basename }}.html )
         $( ${{ inputs.docx }}                                               && echo --docx=${{ inputs.output-basename }}.docx )
@@ -60,5 +60,3 @@ runs:
         ${{ inputs.extra-build-options }}
         ${{ inputs.input-md }}
       shell: sh
-      env:
-        diff_file_name: ${{ inputs.output-basename }}.$(echo ${{ inputs.diffbase }} | cut -c1-20).diff