@@ -62,21 +62,21 @@
 
 /*!
  * The time interval in which the timer will repeat, if it is a repeating
  * timer.
  */
-@property (readonly) of_time_interval_t timeInterval;
+@property (readonly, nonatomic) of_time_interval_t timeInterval;
 
 /*!
  * Whether the timer is repeating.
  */
-@property (readonly, getter=isRepeating) bool repeating;
+@property (readonly, nonatomic, getter=isRepeating) bool repeating;
 
 /*!
  * Whether the timer is valid.
  */
-@property (readonly, getter=isValid) bool valid;
+@property (readonly, nonatomic, getter=isValid) bool valid;
 
 /*!
  * @brief Creates and schedules a new timer with the specified time interval.
  *
  * @param timeInterval The time interval after which the timer should be fired