@@ -62,11 +62,11 @@
 	OF_BLOCK_FIELD_IS_WEAK	 =  16,
 	OF_BLOCK_BYREF_CALLER	 = 128
 };
 
 @protocol RetainRelease
-- retain;
+- (instancetype)retain;
 - (void)release;
 @end
 
 #ifdef OF_OBJFW_RUNTIME
 /* Begin of ObjC module */
@@ -423,16 +423,16 @@
 	objc_registerClassPair((Class)&_NSConcreteMallocBlock);
 # endif
 #endif
 }
 
-+ alloc
++ (instancetype)alloc
 {
 	OF_UNRECOGNIZED_SELECTOR
 }
 
-- init
+- (instancetype)init
 {
 	OF_INVALID_INIT_METHOD
 }
 
 - (void *)allocMemoryWithSize: (size_t)size
@@ -462,24 +462,24 @@
 - (void)freeMemory: (void *)ptr
 {
 	OF_UNRECOGNIZED_SELECTOR
 }
 
-- retain
+- (instancetype)retain
 {
 	if (object_getClass(self) == (Class)&_NSConcreteMallocBlock)
 		return Block_copy(self);
 
 	return self;
 }
 
-- copy
+- (id)copy
 {
 	return Block_copy(self);
 }
 
-- autorelease
+- (instancetype)autorelease
 {
 	if (object_getClass(self) == (Class)&_NSConcreteMallocBlock)
 		return [super autorelease];
 
 	return self;