diff --git a/src/pygamecfg/game_cod4.py b/src/pygamecfg/game_cod4.py
index 420c80c..e8133f6 100644
--- a/src/pygamecfg/game_cod4.py
+++ b/src/pygamecfg/game_cod4.py
@@ -39,7 +39,7 @@ class GameOption_COD4(GameOption):
         self.cfgfile = open(self.mainConfigFilePath, "r", encoding="utf8")  # pylint: disable=consider-using-with
 
     def format_OT_BOOLEAN(self, value: Union[int, str, float]) -> str:
-        return "1" if super().format_OT_BOOLEAN(value) is "True" else "0"
+        return "1" if super().format_OT_BOOLEAN(value).lower() == "true" else "0"
 
     def close(self) -> None:
         self.cfgfile.close()
diff --git a/test/test_cod4.py b/test/test_cod4.py
index 76399a1..19c6f24 100644
--- a/test/test_cod4.py
+++ b/test/test_cod4.py
@@ -79,7 +79,7 @@ class Testtest_cod4(unittest.TestCase):
         with redirect_stdout(StringIO()) as capted_stdout, redirect_stderr(StringIO()) as capted_stderr:
             fct_main(["-g", "cod4", "-b", "test/tmp/COD4", "SetOption", "oldschool", "1"])
             # /!\ add '\n' at the end of the string cause Python terminal newline is always this, regardless Windows / Linux os.linesep
-            # self.assertEqual("setting option <oldschool>  to:  1\n", capted_stdout.getvalue())
+            self.assertEqual("setting option <oldschool>  to:  1\n", capted_stdout.getvalue())
             self.assertEqual("", capted_stderr.getvalue())
 
         with redirect_stdout(StringIO()) as capted_stdout, redirect_stderr(StringIO()) as capted_stderr:
@@ -99,3 +99,15 @@ class Testtest_cod4(unittest.TestCase):
             # /!\ add '\n' at the end of the string cause Python terminal newline is always this, regardless Windows / Linux os.linesep
             self.assertEqual("0\n", capted_stdout.getvalue())
             self.assertEqual("", capted_stderr.getvalue())
+
+        with redirect_stdout(StringIO()) as capted_stdout, redirect_stderr(StringIO()) as capted_stderr:
+            fct_main(["-g", "cod4", "-b", "test/tmp/COD4", "SetOption", "oldschool", "1"])
+            # /!\ add '\n' at the end of the string cause Python terminal newline is always this, regardless Windows / Linux os.linesep
+            self.assertEqual("setting option <oldschool>  to:  1\n", capted_stdout.getvalue())
+            self.assertEqual("", capted_stderr.getvalue())
+
+        with redirect_stdout(StringIO()) as capted_stdout, redirect_stderr(StringIO()) as capted_stderr:
+            fct_main(["-g", "cod4", "-b", "test/tmp/COD4", "GetOption", "oldschool"])
+            # /!\ add '\n' at the end of the string cause Python terminal newline is always this, regardless Windows / Linux os.linesep
+            self.assertEqual("1\n", capted_stdout.getvalue())
+            self.assertEqual("", capted_stderr.getvalue())