diff --git a/pkgs/development/python-modules/cryptoparser/default.nix b/pkgs/development/python-modules/cryptoparser/default.nix
index ad87757592ee..3535b79d30d1 100644
--- a/pkgs/development/python-modules/cryptoparser/default.nix
+++ b/pkgs/development/python-modules/cryptoparser/default.nix
@@ -42,6 +42,14 @@ buildPythonPackage rec {
     urllib3
   ];
 
+  postInstall = ''
+    find $out -name "__pycache__" -type d | xargs rm -rv
+
+    # Prevent creating more binary byte code later (e.g. during
+    # pythonImportsCheck)
+    export PYTHONDONTWRITEBYTECODE=1
+  '';
+
   pythonImportsCheck = [ "cryptoparser" ];
 
   meta = with lib; {