@@ -38,16 +38,16 @@
 @property (readonly, nonatomic) id object;
 
 /*!
  * The requested length of the data that could not be read / written.
  */
-@property (readonly) size_t requestedLength;
+@property (readonly, nonatomic) size_t requestedLength;
 
 /*!
  * The errno of the error that occurred.
  */
-@property (readonly) int errNo;
+@property (readonly, nonatomic) int errNo;
 
 + (instancetype)exception OF_UNAVAILABLE;
 
 /*!
  * @brief Creates a new, autoreleased read or write failed exception.