diff --git a/overrides.nix b/overrides.nix
index 2ceb916..9ce4a5c 100644
--- a/overrides.nix
+++ b/overrides.nix
@@ -1034,6 +1034,28 @@ self: super:
     }
   );
 
+  # pytest-splinter seems to put a .marker file in an empty directory
+  # presumably so it's tracked by and can be installed with MANIFEST.in, see
+  # https://github.com/pytest-dev/pytest-splinter/commit/a48eeef662f66ff9d3772af618748e73211a186b
+  #
+  # This directory then gets used as an empty initial profile directory and is
+  # zipped up. But if the .marker file is in the Nix store, it has the
+  # creation date of 1970, and Zip doesn't work with such old files, so it
+  # fails at runtime!
+  #
+  # We fix this here by just removing the file after the installation
+  #
+  # The error you get without this is:
+  #
+  # E           ValueError: ZIP does not support timestamps before 1980
+  # /nix/store/55b9ip7xkpimaccw9pa0vacy5q94f5xa-python3-3.7.6/lib/python3.7/zipfile.py:357: ValueError
+  pytest-splinter = super.pytest-splinter.overrideAttrs (old: {
+    postInstall = old.postInstall or "" + ''
+      rm $out/${super.python.sitePackages}/pytest_splinter/profiles/firefox/.marker
+    '';
+  });
+
+
   ffmpeg-python = super.ffmpeg-python.overridePythonAttrs (
     old: {
       buildInputs = old.buildInputs ++ [ self.pytest-runner ];