@@ -111,10 +111,12 @@
 - (instancetype)initWithItemSize: (size_t)itemSize capacity: (size_t)capacity
 {
 	return (id)[[OFConcreteMutableData alloc] initWithItemSize: itemSize
 							  capacity: capacity];
 }
+
+OF_SINGLETON_METHODS
 @end
 
 @implementation OFMutableData
 + (void)initialize
 {