@@ -16,10 +16,12 @@
 
 #import "OFException.h"
 
 @class OFXMLParser;
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFMalformedXMLException \
  *	  OFMalformedXMLException.h ObjFW/OFMalformedXMLException.h
  *
  * @brief An exception indicating that a parser encountered malformed XML.
@@ -30,23 +32,25 @@
 }
 
 /*!
  * The parser which encountered malformed XML.
  */
-@property (readonly, nonatomic) OFXMLParser *parser;
+@property OF_NULLABLE_PROPERTY (readonly, nonatomic) OFXMLParser *parser;
 
 /*!
  * @brief Creates a new, autoreleased malformed XML exception.
  *
  * @param parser The parser which encountered malformed XML
  * @return A new, autoreleased malformed XML exception
  */
-+ (instancetype)exceptionWithParser: (OFXMLParser*)parser;
++ (instancetype)exceptionWithParser: (nullable OFXMLParser*)parser;
 
 /*!
  * @brief Initializes an already allocated malformed XML exception.
  *
  * @param parser The parser which encountered malformed XML
  * @return An initialized malformed XML exception
  */
-- initWithParser: (OFXMLParser*)parser;
+- initWithParser: (nullable OFXMLParser*)parser;
 @end
+
+OF_ASSUME_NONNULL_END