@@ -1139,11 +1139,11 @@
 - mutableCopy
 {
 	return [[OFMutableString alloc] initWithString: self];
 }
 
-- (of_comparison_result_t)compare: (id)object
+- (of_comparison_result_t)compare: (id <OFComparing>)object
 {
 	void *pool;
 	OFString *otherString;
 	const of_unichar_t *unicodeString, *otherUnicodeString;
 	size_t i, minimumLength;
@@ -1154,11 +1154,11 @@
 	if (![object isKindOfClass: [OFString class]])
 		@throw [OFInvalidArgumentException
 		    exceptionWithClass: [self class]
 			      selector: _cmd];
 
-	otherString = object;
+	otherString = (OFString*)object;
 	minimumLength = ([self length] > [otherString length]
 	    ? [otherString length] : [self length]);
 
 	pool = objc_autoreleasePoolPush();