diff --git a/process-static b/process-static
index 7d113146..9996f794 100755
--- a/process-static
+++ b/process-static
@@ -40,5 +40,10 @@ for file in static_tmp/**/*.@(atom|xml); do
     xmllint --noblanks "$file" --output "$file"
 done
 
+brotli_k() {
+    brotli -k "$@"
+}
+export -f brotli_k
+
 find static_tmp -regex '.+\.\(atom\|css\|html\|ico\|js\|json\|mjs\|pdf\|svg\|txt\|webmanifest\|xml\)' |
-    parallel "brotli -k {}; zopfli {}"
+    parallel -q ::: brotli_k zopfli :::: -