@@ -279,21 +279,21 @@
 	return [[OFMutableString alloc] initWithString: self];
 }
 
 - (BOOL)isEqual: (id)obj
 {
-	if (![obj isKindOf: [OFString class]])
+	if (![obj isKindOfClass: [OFString class]])
 		return NO;
 	if (strcmp(string, [obj cString]))
 		return NO;
 
 	return YES;
 }
 
 - (int)compare: (id)obj
 {
-	if (![obj isKindOf: [OFString class]])
+	if (![obj isKindOfClass: [OFString class]])
 		@throw [OFInvalidArgumentException newWithClass: isa
 						    andSelector: _cmd];
 
 	return strcmp(string, [obj cString]);
 }