diff --git a/pkgs/development/libraries/libxml2/default.nix b/pkgs/development/libraries/libxml2/default.nix
index b6f769078ad..9481f2bbdc3 100644
--- a/pkgs/development/libraries/libxml2/default.nix
+++ b/pkgs/development/libraries/libxml2/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, zlib, xz, python, findXMLCatalogs, libiconv
+{ stdenv, lib, fetchurl, zlib, xz, python, findXMLCatalogs, libiconv, fetchpatch
 , supportPython ? (! stdenv ? cross) }:
 
 stdenv.mkDerivation rec {
@@ -10,6 +10,13 @@ stdenv.mkDerivation rec {
     sha256 = "0g336cr0bw6dax1q48bblphmchgihx9p1pjmxdnrd6sh3qci3fgz";
   };
 
+  # https://bugzilla.gnome.org/show_bug.cgi?id=766834#c5
+  postPatch = "patch -R < " + fetchpatch {
+    name = "schemas-validity.patch";
+    url = "https://git.gnome.org/browse/libxml2/patch/?id=f6599c5164";
+    sha256 = "0i7a0nhxwkxx6dkm8917qn0bsfn1av6ghg2f4dxanxi4bn4b1jjn";
+  };
+
   outputs = [ "dev" "out" "bin" "doc" ]
     ++ lib.optional supportPython "py";
   propagatedBuildOutputs = "out bin" + lib.optionalString supportPython " py";