@@ -30,10 +30,13 @@
 #import "macros.h"
 
 static struct {
 	Class isa;
 } placeholder;
+
+@interface OFMutableArray_placeholder: OFMutableArray
+@end
 
 @implementation OFMutableArray_placeholder
 - init
 {
 	return (id)[[OFMutableArray_adjacent alloc] init];