1 files changed, 1 insertions, 1 deletions
diff --git a/sources/shiboken2/libshiboken/sbkstring.h b/sources/shiboken2/libshiboken/sbkstring.h
index ec674ee7b..7f434e1b9 100644
--- a/sources/shiboken2/libshiboken/sbkstring.h
+++ b/sources/shiboken2/libshiboken/sbkstring.h
@@ -59,7 +59,7 @@ namespace String
     LIBSHIBOKEN_API bool isConvertible(PyObject *obj);
     LIBSHIBOKEN_API PyObject *fromCString(const char *value);
     LIBSHIBOKEN_API PyObject *fromCString(const char *value, int len);
-    LIBSHIBOKEN_API const char *toCString(PyObject *str, Py_ssize_t *len = 0);
+    LIBSHIBOKEN_API const char *toCString(PyObject *str, Py_ssize_t *len = nullptr);
     LIBSHIBOKEN_API bool concat(PyObject **val1, PyObject *val2);
     LIBSHIBOKEN_API PyObject *fromFormat(const char *format, ...);
     LIBSHIBOKEN_API PyObject *fromStringAndSize(const char *str, Py_ssize_t size);