@@ -29,11 +29,11 @@
  */
 @protocol OFCryptoHash <OFObject, OFCopying>
 /*!
  * A boolean whether the hash has already been calculated.
  */
-@property (readonly, getter=isCalculated) bool calculated;
+@property (readonly, nonatomic, getter=isCalculated) bool calculated;
 
 /*!
  * @brief Creates a new cryptographic hash.
  *
  * @return A new autoreleased OFCryptoHash