@@ -177,10 +177,11 @@
 # define _Null_unspecified
 # define OF_NULLABLE_PROPERTY
 # define OF_NULL_RESETTABLE_PROPERTY
 # define nonnull
 # define nullable
+# define null_unspecified
 #endif
 
 #if __has_feature(objc_kindof)
 # define OF_KINDOF(cls) __kindof cls
 #else