diff --git a/src/rpcclient/rpcclient/darwin/cfpreferences.py b/src/rpcclient/rpcclient/darwin/cfpreferences.py
index 86c7e0ed..eb807d83 100644
--- a/src/rpcclient/rpcclient/darwin/cfpreferences.py
+++ b/src/rpcclient/rpcclient/darwin/cfpreferences.py
@@ -45,7 +45,7 @@ def get_values(self, application_id: str, username: str = kCFPreferencesCurrentU
             result[k] = self.get_value(k, application_id, username, hostname)
         return result
 
-    def set(self, key: str, value: str, application_id: str, username: str = kCFPreferencesCurrentUser,
+    def set(self, key: str, value, application_id: str, username: str = kCFPreferencesCurrentUser,
             hostname: str = kCFPreferencesCurrentHost):
         self._client.symbols.CFPreferencesSetValue(self._client.cf(key), self._client.cf(value),
                                                    self._client.cf(application_id), self._client.cf(username),
diff --git a/src/rpcclient/tests/test_core_foundation_types.py b/src/rpcclient/tests/test_core_foundation_types.py
index 3482add2..82e57dce 100644
--- a/src/rpcclient/tests/test_core_foundation_types.py
+++ b/src/rpcclient/tests/test_core_foundation_types.py
@@ -1,4 +1,5 @@
 import datetime
+
 import pytest