diff --git a/pkgs/development/python-modules/javaproperties/default.nix b/pkgs/development/python-modules/javaproperties/default.nix
index 93c4252d0dd..dd3c027bca2 100644
--- a/pkgs/development/python-modules/javaproperties/default.nix
+++ b/pkgs/development/python-modules/javaproperties/default.nix
@@ -7,6 +7,7 @@
 buildPythonPackage rec {
   version = "0.8.0";
   pname = "javaproperties";
+  format = "pyproject";
 
   src = fetchFromGitHub {
     owner = "jwodder";