@@ -26,10 +26,13 @@
 #import "OFNotImplementedException.h"
 
 static struct {
 	Class isa;
 } placeholder;
+
+@interface OFCountedSet_placeholder: OFCountedSet
+@end
 
 @implementation OFCountedSet_placeholder
 - init
 {
 	return (id)[[OFCountedSet_hashtable alloc] init];