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-rw-r--r--src/objc/utils/MCOIndexSet.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/objc/utils/MCOIndexSet.h b/src/objc/utils/MCOIndexSet.h
index 38ec3834..97d368ec 100644
--- a/src/objc/utils/MCOIndexSet.h
+++ b/src/objc/utils/MCOIndexSet.h
@@ -16,7 +16,7 @@
/** similar to NSMutableIndexSet but supports int64_t*/
-@interface MCOIndexSet : NSObject <NSCopying>
+@interface MCOIndexSet : NSObject <NSCopying, NSCoding>
/** Creates an empty index set.*/
+ (MCOIndexSet *) indexSet;