diff --git a/src/main/java/com/exactpro/th2/FixHandler.java b/src/main/java/com/exactpro/th2/FixHandler.java
index 1e54f98..eb5ab83 100644
--- a/src/main/java/com/exactpro/th2/FixHandler.java
+++ b/src/main/java/com/exactpro/th2/FixHandler.java
@@ -1433,6 +1433,8 @@ private Map<String, String> fakeRetransmissionOutgoingProcessor(ByteBuf message,
         strategy.getState().addMissedMessageToCacheIfCondition(msgSeqNum.get(), Unpooled.copiedBuffer(message), x -> true);
 
         sendingTime.insertNext(POSS_DUP_TAG, IS_POSS_DUP).insertNext(POSS_RESEND_TAG, IS_POSS_DUP);
+        updateLength(message);
+        updateChecksum(message);
 
         return null;
     }