@@ -231,11 +231,11 @@
 	return [[[self alloc] initWithCapacity: capacity] autorelease];
 }
 
 - (instancetype)init
 {
-	if (object_getClass(self) == [OFMutableArray class]) {
+	if ([self isMemberOfClass: [OFMutableArray class]]) {
 		@try {
 			[self doesNotRecognizeSelector: _cmd];
 			abort();
 		} @catch (id e) {
 			[self release];