@@ -35,11 +35,11 @@
  *
  * @param string The XML string which contains an unknown entity
  * @param entity The XML entity which is unknown
  * @return A replacement string for the unknown entity
  */
-typedef __nullable OFString* (^of_string_xml_unescaping_block_t)(
+typedef OFString *OF_NULLABLE (^of_string_xml_unescaping_block_t)(
     OFString *string, OFString *entity);
 #endif
 
 /*!
  * @protocol OFStringXMLUnescapingDelegate OFString.h ObjFW/OFString.h