@@ -27,13 +27,13 @@
 	return [[[self alloc] initWithFirstObject: firstObject
 				     secondObject: secondObject
 				      thirdObject: thirdObject] autorelease];
 }
 
-- initWithFirstObject: (id)firstObject
-	 secondObject: (id)secondObject
-	  thirdObject: (id)thirdObject
+- (instancetype)initWithFirstObject: (id)firstObject
+		       secondObject: (id)secondObject
+			thirdObject: (id)thirdObject
 {
 	self = [super init];
 
 	@try {
 		_firstObject = [firstObject retain];
@@ -108,16 +108,16 @@
 	OF_HASH_FINALIZE(hash);
 
 	return hash;
 }
 
-- copy
+- (id)copy
 {
 	return [self retain];
 }
 
-- mutableCopy
+- (id)mutableCopy
 {
 	return [[OFMutableTriple alloc] initWithFirstObject: _firstObject
 					       secondObject: _secondObject
 						thirdObject: _thirdObject];
 }