diff --git a/Include/internal/pycore_pyerrors.h b/Include/internal/pycore_pyerrors.h
index 1187cbf7e90..15071638203 100644
--- a/Include/internal/pycore_pyerrors.h
+++ b/Include/internal/pycore_pyerrors.h
@@ -168,7 +168,8 @@ void _PyErr_FormatNote(const char *format, ...);
 Py_DEPRECATED(3.12) extern void _PyErr_ChainExceptions(PyObject *, PyObject *, PyObject *);
 
 // implementation detail for the codeop module.
-extern PyTypeObject _PyExc_IncompleteInputError;
+// Exported for test.test_peg_generator.test_c_parser
+PyAPI_DATA(PyTypeObject) _PyExc_IncompleteInputError;
 #define PyExc_IncompleteInputError ((PyObject *)(&_PyExc_IncompleteInputError))
 
 #ifdef __cplusplus