@@ -44,10 +44,12 @@
 /*!
  * The value for the undefined key
  */
 @property (readonly, nonatomic) id value;
 
++ (instancetype)exception OF_UNAVAILABLE;
+
 /*!
  * @brief Creates a new, autoreleased undefined key exception.
  *
  * @param object The object on which the key is undefined
  * @param key The key which is undefined
@@ -67,10 +69,12 @@
  * @return A new, autoreleased undefined key exception
  */
 + (instancetype)exceptionWithObject: (id)object
 				key: (OFString *)key
 			      value: (id)value;
+
+- init OF_UNAVAILABLE;
 
 /*!
  * @brief Initializes an already allocated undefined key exception.
  *
  * @param object The object on which the key is undefined