diff --git a/pkgs/development/python-modules/heatzypy/default.nix b/pkgs/development/python-modules/heatzypy/default.nix
index 0bd151e236af..24b351494303 100644
--- a/pkgs/development/python-modules/heatzypy/default.nix
+++ b/pkgs/development/python-modules/heatzypy/default.nix
@@ -18,15 +18,21 @@ buildPythonPackage rec {
     owner = "Cyr-ius";
     repo = pname;
     rev = "refs/tags/${version}";
-    sha256 = "sha256-4/v0xodpJzVi6/ciW5icqDFGCtBFKtGoMB92CknH9xw=";
+    hash = "sha256-4/v0xodpJzVi6/ciW5icqDFGCtBFKtGoMB92CknH9xw=";
   };
 
+  postPatch = ''
+    # https://github.com/Cyr-ius/heatzypy/issues/7
+    substituteInPlace setup.py \
+      --replace 'version="replace_by_workflow"' 'version="${version}"'
+  '';
+
   propagatedBuildInputs = [
     aiohttp
     requests
   ];
 
-  # Project has no tests
+  # Module has no tests
   doCheck = false;
 
   pythonImportsCheck = [