@@ -65,11 +65,11 @@
 	if (self == [OFStream class])
 		signal(SIGPIPE, SIG_IGN);
 }
 #endif
 
-- init
+- (instancetype)init
 {
 	if (object_getClass(self) == [OFStream class]) {
 		@try {
 			[self doesNotRecognizeSelector: _cmd];
 			abort();
@@ -101,11 +101,11 @@
 		       length: (size_t)length
 {
 	OF_UNRECOGNIZED_SELECTOR
 }
 
-- copy
+- (id)copy
 {
 	return [self retain];
 }
 
 - (bool)isAtEndOfStream