diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index 1d19e95..34bbd0b 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -46,4 +46,10 @@ jobs:
 
       - uses: r-lib/actions/check-r-package@v2
         with:
-          upload-snapshots: true
\ No newline at end of file
+          upload-snapshots: true
+          
+      - name: Install tidy (on Linux if running vignettes)
+        if: runner.os == 'Linux' && contains(matrix.config.flags, 'vignettes')
+        run: |
+          /usr/bin/sudo DEBIAN_FRONTEND=noninteractive apt-get install -y tidy
+        shell: bash
\ No newline at end of file