@@ -39,11 +39,11 @@
 + (OFNull *)null
 {
 	return null;
 }
 
-- initWithSerialization: (OFXMLElement *)element
+- (instancetype)initWithSerialization: (OFXMLElement *)element
 {
 	void *pool;
 
 	[self release];
 
@@ -61,11 +61,11 @@
 - (OFString *)description
 {
 	return @"<null>";
 }
 
-- copy
+- (id)copy
 {
 	return self;
 }
 
 - (OFXMLElement *)XMLElementBySerializing
@@ -107,16 +107,16 @@
 
 	return [OFData dataWithItems: &type
 			       count: 1];
 }
 
-- autorelease
+- (instancetype)autorelease
 {
 	return self;
 }
 
-- retain
+- (instancetype)retain
 {
 	return self;
 }
 
 - (void)release