diff --git a/SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m b/SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m
index bc977b470..b277825e9 100644
--- a/SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m
+++ b/SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m
@@ -431,7 +431,7 @@ NSString *const kTSOutgoingMessageSentRecipientAll = @"kTSOutgoingMessageSentRec
 
     TSOutgoingMessageRecipientState *_Nullable result = self.recipientStateMap[recipientId];
     OWSAssert(result);
-    return result;
+    return [result copy];
 }
 
 #pragma mark - Update With... Methods