diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 1c6acd3ddd9..51d9647b929 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -13650,6 +13650,8 @@ in {
 
     buildInputs = with self; [ pkgs.libxml2 pkgs.libxslt ];
 
+    hardeningDisable = stdenv.lib.optional stdenv.isDarwin "format";
+
     meta = {
       description = "Pythonic binding for the libxml2 and libxslt libraries";
       homepage = http://lxml.de;
@@ -13668,6 +13670,8 @@ in {
 
     buildInputs = with self; [ pkgs.libxml2 pkgs.libxslt ];
 
+    hardeningDisable = stdenv.lib.optional stdenv.isDarwin "format";
+
     meta = {
       description = "Pythonic binding for the libxml2 and libxslt libraries";
       homepage = http://lxml.de;