@@ -74,11 +74,12 @@
  * @param thirdObject The second object for the triple
  * @return An initialized OFTriple
  */
 - (instancetype)initWithFirstObject: (nullable FirstType)firstObject
 		       secondObject: (nullable SecondType)secondObject
-			thirdObject: (nullable ThirdType)thirdObject;
+			thirdObject: (nullable ThirdType)thirdObject
+    OF_DESIGNATED_INITIALIZER;
 #if !defined(OF_HAVE_GENERICS) && !defined(DOXYGEN)
 # undef FirstType
 # undef SecondType
 # undef ThirdType
 #endif