diff --git a/pkgs/development/python-modules/setuptools/default.nix b/pkgs/development/python-modules/setuptools/default.nix
index f30e8dd5cdb..987c75ba5a0 100644
--- a/pkgs/development/python-modules/setuptools/default.nix
+++ b/pkgs/development/python-modules/setuptools/default.nix
@@ -38,7 +38,7 @@ let
       # Here we untar the sdist and retar it in order to control the timestamps
       # of all the files included
       tar -xzf dist/${pname}-${version}.post0.tar.gz -C dist/
-      tar -czf dist/${name} -C dist/ --mtime="@$SOURCE_DATE_EPOCH"  ${pname}-${version}.post0
+      tar -czf dist/${name} -C dist/ --mtime="@$SOURCE_DATE_EPOCH" --sort=name ${pname}-${version}.post0
     '';
 
     installPhase = ''