diff --git a/pkgs/development/python-modules/vacuum-map-parser-roborock/default.nix b/pkgs/development/python-modules/vacuum-map-parser-roborock/default.nix
index 342be62bf7d5..1bccdf0af09b 100644
--- a/pkgs/development/python-modules/vacuum-map-parser-roborock/default.nix
+++ b/pkgs/development/python-modules/vacuum-map-parser-roborock/default.nix
@@ -21,6 +21,12 @@ buildPythonPackage rec {
     hash = "sha256-cZNmoqzU73iF965abFeM6qgEVmg6j2kIQHDhj1MYQpE=";
   };
 
+  postPatch = ''
+    # Upstream doesn't set a version in the pyproject.toml file
+    substituteInPlace pyproject.toml \
+      --replace "0.0.0" "${version}"
+  '';
+
   nativeBuildInputs = [ poetry-core ];
 
   propagatedBuildInputs = [