@@ -217,11 +217,12 @@
  *	  time since 1970-01-01T00:00:00Z.
  *
  * @param seconds The seconds since 1970-01-01T00:00:00Z
  * @return An initialized OFDate with the specified date and time
  */
-- (instancetype)initWithTimeIntervalSince1970: (of_time_interval_t)seconds;
+- (instancetype)initWithTimeIntervalSince1970: (of_time_interval_t)seconds
+    OF_DESIGNATED_INITIALIZER;
 
 /*!
  * @brief Initializes an already allocated OFDate with the specified date and
  *	  time since now.
  *