diff --git a/pkgs/development/python-modules/virtualenv-clone/default.nix b/pkgs/development/python-modules/virtualenv-clone/default.nix
index 056e38a32923..36d6ca88faf4 100644
--- a/pkgs/development/python-modules/virtualenv-clone/default.nix
+++ b/pkgs/development/python-modules/virtualenv-clone/default.nix
@@ -20,11 +20,11 @@ buildPythonPackage rec {
 
   postPatch = ''
     substituteInPlace tests/__init__.py \
-      --replace "'virtualenv'" "'${virtualenv}/bin/virtualenv'" \
-      --replace "'3.9', '3.10']" "'3.9', '3.10', '3.11', '3.12']" # if the Python version used isn't in this list, tests fail
+      --replace-fail "'virtualenv'" "'${virtualenv}/bin/virtualenv'" \
+      --replace-fail "'3.9', '3.10']" "'3.9', '3.10', '3.11', '3.12', '3.13']" # if the Python version used isn't in this list, tests fail
 
     substituteInPlace tests/test_virtualenv_sys.py \
-      --replace "'virtualenv'" "'${virtualenv}/bin/virtualenv'"
+      --replace-fail "'virtualenv'" "'${virtualenv}/bin/virtualenv'"
   '';
 
   propagatedBuildInputs = [ virtualenv ];