@@ -1550,21 +1550,21 @@
 - (id)mutableCopy
 {
 	return [[OFMutableString alloc] initWithString: self];
 }
 
-- (of_comparison_result_t)compare: (id <OFObject, OFComparing>)object
+- (of_comparison_result_t)compare: (id <OFComparing>)object
 {
 	void *pool;
 	OFString *otherString;
 	const of_unichar_t *characters, *otherCharacters;
 	size_t minimumLength;
 
 	if (object == self)
 		return OF_ORDERED_SAME;
 
-	if (![object isKindOfClass: [OFString class]])
+	if (![(id)object isKindOfClass: [OFString class]])
 		@throw [OFInvalidArgumentException exception];
 
 	otherString = (OFString *)object;
 	minimumLength = ([self length] > [otherString length]
 	    ? [otherString length] : [self length]);