@@ -138,13 +138,13 @@
 	self = [super init];
 
 	@try {
 		_iVarsData = [[OFSecureData alloc]
 		    initWithCount: sizeof(*_iVars)];
-		_iVars = [_iVarsData items];
+		_iVars = _iVarsData.mutableItems;
 
-		if ([self class] == [OFSHA224Or256Hash class]) {
+		if (self.class == [OFSHA224Or256Hash class]) {
 			[self doesNotRecognizeSelector: _cmd];
 			abort();
 		}
 
 		[self of_resetState];
@@ -171,11 +171,11 @@
 - (id)copy
 {
 	OFSHA224Or256Hash *copy = [[[self class] alloc] of_init];
 
 	copy->_iVarsData = [_iVarsData copy];
-	copy->_iVars = [copy->_iVarsData items];
+	copy->_iVars = copy->_iVarsData.mutableItems;
 	copy->_calculated = _calculated;
 
 	return copy;
 }