diff --git a/pkgs/os-specific/linux/cryptsetup/default.nix b/pkgs/os-specific/linux/cryptsetup/default.nix
index 2b5c3817ddf..4eec4754ca9 100644
--- a/pkgs/os-specific/linux/cryptsetup/default.nix
+++ b/pkgs/os-specific/linux/cryptsetup/default.nix
@@ -19,6 +19,9 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     patchShebangs tests
+    ${stdenv.lib.optionalString enablePython ''
+      patchShebangs ./python/pycryptsetup-test.py
+    ''}
 
     # O_DIRECT is filesystem dependent and fails in a sandbox (on tmpfs)
     # and on several filesystem types (btrfs, zfs) without sandboxing.