@@ -26,10 +26,11 @@
 #import "OFHashAlreadyCalculatedException.h"
 #import "OFOutOfRangeException.h"
 
 #define BLOCK_SIZE 64
 
+OF_DIRECT_MEMBERS
 @interface OFSHA224Or256Hash ()
 - (void)of_resetState;
 @end
 
 static const uint32_t table[] = {