@@ -70,22 +70,22 @@
  */
 + (instancetype)exceptionWithObject: (id)object
 				key: (OFString *)key
 			      value: (nullable id)value;
 
-- init OF_UNAVAILABLE;
+- (instancetype)init OF_UNAVAILABLE;
 
 /*!
  * @brief Initializes an already allocated undefined key exception.
  *
  * @param object The object on which the key is undefined
  * @param key The key which is undefined
  *
  * @return An initialized undefined key exception
  */
-- initWithObject: (id)object
-	     key: (OFString *)key;
+- (instancetype)initWithObject: (id)object
+			   key: (OFString *)key;
 
 /*!
  * @brief Initializes an already allocated undefined key exception.
  *
  * @param object The object on which the key is undefined
@@ -92,11 +92,11 @@
  * @param key The key which is undefined
  * @param value The value for the undefined key
  *
  * @return An initialized undefined key exception
  */
-- initWithObject: (id)object
-	     key: (OFString *)key
-	   value: (nullable id)value OF_DESIGNATED_INITIALIZER;
+- (instancetype)initWithObject: (id)object
+			   key: (OFString *)key
+			 value: (nullable id)value OF_DESIGNATED_INITIALIZER;
 @end
 
 OF_ASSUME_NONNULL_END