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-rw-r--r--src/objc/abstract/MCOMessageHeader.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/objc/abstract/MCOMessageHeader.h b/src/objc/abstract/MCOMessageHeader.h
index 350c1379..873c45d8 100644
--- a/src/objc/abstract/MCOMessageHeader.h
+++ b/src/objc/abstract/MCOMessageHeader.h
@@ -14,7 +14,7 @@
@class MCOAddress;
-@interface MCOMessageHeader : NSObject
+@interface MCOMessageHeader : NSObject <NSCopying>
@property (nonatomic, copy) NSString * messageID;
@property (nonatomic, copy) NSArray * references;