python
diff --git a/‎Lib/test/test_clinic.py
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+5Lines changed: 5 additions & 0 deletions b/‎Lib/test/test_clinic.py
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+5Lines changed: 5 additions & 0 deletions
diff --git a/‎Modules/_testclinic.c
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+20Lines changed: 20 additions & 0 deletions b/‎Modules/_testclinic.c
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+20Lines changed: 20 additions & 0 deletions
diff --git a/‎Modules/clinic/_testclinic.c.h
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+59-1Lines changed: 59 additions & 1 deletion b/‎Modules/clinic/_testclinic.c.h
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+59-1Lines changed: 59 additions & 1 deletion
diff --git a/‎Tools/clinic/libclinic/converters.py
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+2-1Lines changed: 2 additions & 1 deletion b/‎Tools/clinic/libclinic/converters.py
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+2-1Lines changed: 2 additions & 1 deletion
@@ -3023,6 +3023,11 @@ def test_bool_converter(self):
         self.assertEqual(ac_tester.bool_converter('', [], 5), (False, False, True))
         self.assertEqual(ac_tester.bool_converter(('not empty',), {1: 2}, 0), (True, True, False))
 
+    def test_bool_converter_c_default(self):
+        self.assertEqual(ac_tester.bool_converter_c_default(), (1, 0, -2, -3))
+        self.assertEqual(ac_tester.bool_converter_c_default(False, True, False, True),
+                         (0, 1, 0, 1))
+
     def test_char_converter(self):
         with self.assertRaises(TypeError):
             ac_tester.char_converter(1)
 
@@ -209,6 +209,25 @@ bool_converter_impl(PyObject *module, int a, int b, int c)
 }
 
 
+/*[clinic input]
+bool_converter_c_default
+
+    a: bool = True
+    b: bool = False
+    c: bool(c_default="-2") = True
+    d: bool(c_default="-3") = x
+    /
+
+[clinic start generated code]*/
+
+static PyObject *
+bool_converter_c_default_impl(PyObject *module, int a, int b, int c, int d)
+/*[clinic end generated code: output=cf204382e1e4c30c input=185786302ab84081]*/
+{
+    return Py_BuildValue("iiii", a, b, c, d);
+}
+
+
 /*[clinic input]
 char_converter
 
@@ -1888,6 +1907,7 @@ static PyMethodDef tester_methods[] = {
     BYTE_ARRAY_OBJECT_CONVERTER_METHODDEF
     UNICODE_CONVERTER_METHODDEF
     BOOL_CONVERTER_METHODDEF
+    BOOL_CONVERTER_C_DEFAULT_METHODDEF
     CHAR_CONVERTER_METHODDEF
     UNSIGNED_CHAR_CONVERTER_METHODDEF
     SHORT_CONVERTER_METHODDEF
 
@@ -30,7 +30,8 @@ def converter_init(self, *, accept: TypeSet = {object}) -> None:
             fail(f"bool_converter: illegal 'accept' argument {accept!r}")
         if self.default is not unspecified and self.default is not unknown:
             self.default = bool(self.default)
-            self.c_default = str(int(self.default))
+            if self.c_default in {'Py_True', 'Py_False'}:
+                self.c_default = str(int(self.default))
 
     def parse_arg(self, argname: str, displayname: str, *, limited_capi: bool) -> str | None:
         if self.format_unit == 'i':