@@ -806,20 +806,20 @@
 		return false;
 
 	return true;
 }
 
-- (of_comparison_result_t)compare: (id <OFObject, OFComparing>)object
+- (of_comparison_result_t)compare: (id <OFComparing>)object
 {
 	OFString *otherString;
 	size_t otherCStringLength, minimumCStringLength;
 	int compare;
 
 	if (object == self)
 		return OF_ORDERED_SAME;
 
-	if (![object isKindOfClass: [OFString class]])
+	if (![(id)object isKindOfClass: [OFString class]])
 		@throw [OFInvalidArgumentException exception];
 
 	otherString = (OFString *)object;
 	otherCStringLength = [otherString UTF8StringLength];
 	minimumCStringLength = (_s->cStringLength > otherCStringLength