diff --git a/flake.nix b/flake.nix
index 3a69ad6..829a844 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,7 +39,8 @@
               -name '*.xml' -or \
               -name '*.txt' -or \
               -name '*.css' -or \
-              -name '*.map' | \
+              -name '*.map' -or \
+              -name '*.pdf' | \
                 ${pkgs.parallel}/bin/parallel --eta \
                   "${pkgs.zopfli}/bin/zopfli {} && ${pkgs.brotli}/bin/brotli {}"
         '';