diff --git a/Runtime/MkCastTo.py b/Runtime/MkCastTo.py
index 908c363dd..9c7d7e45e 100644
--- a/Runtime/MkCastTo.py
+++ b/Runtime/MkCastTo.py
@@ -183,8 +183,8 @@ for tp in CENTITY_TYPES:
         qual = getqualified(tp)
         sourcef.write('''template <class T>
 void TCastToPtr<T>::Visit(%s* p) {
-  static_assert(sizeof(T) > 0 && !std::is_void<T>::value, "TCastToPtr can not cast to incomplete type");
-  ptr = reinterpret_cast<T*>(std::is_convertible<%s*, T*>::value ? p : nullptr);
+  static_assert(sizeof(T) > 0 && !std::is_void_v<T>, "TCastToPtr can not cast to incomplete type");
+  ptr = reinterpret_cast<T*>(std::is_convertible_v<%s*, T*> ? p : nullptr);
 }
 
 ''' % (qual, qual))