diff --git a/flake.nix b/flake.nix
index f8a0ebb..cc0d65f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -52,7 +52,7 @@
           hydra-product = pkgs.runCommandNoCC "seminararbeit-hydra" { } ''
             install -D ${packages.seminararbeit} $out/seminararbeit.pdf
             mkdir -p $out/nix-support
-            echo "doc seminararbeit $out/seminararbeit.pdf" >> $out/nix-support/hydra-build-products
+            echo "doc-pdf seminararbeit $out/seminararbeit.pdf" >> $out/nix-support/hydra-build-products
           '';
         }
         else { };