diff --git a/pkgs/development/python-modules/minio/default.nix b/pkgs/development/python-modules/minio/default.nix
index ddb2905bc1d9..8db828aae007 100644
--- a/pkgs/development/python-modules/minio/default.nix
+++ b/pkgs/development/python-modules/minio/default.nix
@@ -32,6 +32,11 @@ buildPythonPackage rec {
     hash = "sha256-hZn1T75JbnJ5lIyWnX3f8r6OET/d6ZltuRr6jjYOp2o=";
   };
 
+  postPatch = ''
+    substituteInPlace tests/unit/crypto_test.py \
+      --replace-fail "assertEquals" "assertEqual"
+  '';
+
   nativeBuildInputs = [
     setuptools
   ];