diff --git a/.github/workflows/manual-rendering.yml b/.github/workflows/manual-rendering.yml
index 6c4a9507c5ca..4f5486f2acff 100644
--- a/.github/workflows/manual-rendering.yml
+++ b/.github/workflows/manual-rendering.yml
@@ -44,6 +44,7 @@ jobs:
       - name: Compare DocBook and MD manuals
         id: check
         run: |
+          export NIX_PATH=nixpkgs=$(pwd)
           .github/workflows/compare-manuals.sh \
             docbook/share/doc/nixos/options.html \
             md/share/doc/nixos/options.html