diff --git a/pkgs/development/python-modules/mopeka-iot-ble/default.nix b/pkgs/development/python-modules/mopeka-iot-ble/default.nix
index 178daed3fac5..a5bb698aa1af 100644
--- a/pkgs/development/python-modules/mopeka-iot-ble/default.nix
+++ b/pkgs/development/python-modules/mopeka-iot-ble/default.nix
@@ -13,7 +13,7 @@
 buildPythonPackage rec {
   pname = "mopeka-iot-ble";
   version = "0.5.0";
-  format = "pyproject";
+  pyproject = true;
 
   disabled = pythonOlder "3.9";
 
@@ -24,6 +24,11 @@ buildPythonPackage rec {
     hash = "sha256-m27As3tB77JbgY0kDDJ6kmYFTv2O/Sh6y9tFiKDIjbI=";
   };
 
+  postPatch = ''
+    substituteInPlace pyproject.toml \
+      --replace " --cov=mopeka_iot_ble --cov-report=term-missing:skip-covered" ""
+  '';
+
   nativeBuildInputs = [
     poetry-core
   ];
@@ -39,11 +44,6 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
-  postPatch = ''
-    substituteInPlace pyproject.toml \
-      --replace " --cov=mopeka_iot_ble --cov-report=term-missing:skip-covered" ""
-  '';
-
   pythonImportsCheck = [
     "mopeka_iot_ble"
   ];