diff --git a/doc/default.nix b/doc/default.nix
index 196b9e445390..0e7cd842afd2 100644
--- a/doc/default.nix
+++ b/doc/default.nix
@@ -63,9 +63,9 @@ stdenv.mkDerivation {
   + ''
     echo ${nixpkgsVersion} > .version
 
-    xmllint --noout --nonet --xinclude --noxincludenode \
-      --relaxng ${docbook5}/xml/rng/docbook/docbook.rng \
-      manual.xml
+    # validate against relaxng schema
+    xmllint --nonet --xinclude --noxincludenode manual.xml --output manual-full.xml
+    ${jing}/bin/jing ${docbook5}/xml/rng/docbook/docbook.rng manual-full.xml
 
     dst=$out/share/doc/nixpkgs
     mkdir -p $dst