diff --git a/eu.dariolucia.ccsds.tmtc/src/test/java/eu/dariolucia/ccsds/tmtc/datalink/channel/sender/TcSenderVirtualChannelTest.java b/eu.dariolucia.ccsds.tmtc/src/test/java/eu/dariolucia/ccsds/tmtc/datalink/channel/sender/TcSenderVirtualChannelTest.java
index e0ade596..23b1cbde 100644
--- a/eu.dariolucia.ccsds.tmtc/src/test/java/eu/dariolucia/ccsds/tmtc/datalink/channel/sender/TcSenderVirtualChannelTest.java
+++ b/eu.dariolucia.ccsds.tmtc/src/test/java/eu/dariolucia/ccsds/tmtc/datalink/channel/sender/TcSenderVirtualChannelTest.java
@@ -394,10 +394,13 @@ public void testLargePacketSegmented() throws IOException {
 
             byte[] segment = fr.getDataFieldCopy();
             if (i == 0) {
+                assertEquals(1, (segment[0] & 0xC0) >> 6);
                 assertEquals(TcTransferFrame.SequenceFlagType.FIRST, fr.getSequenceFlag());
             } else if (i == 3) {
+                assertEquals(2, (segment[0] & 0xC0) >> 6);
                 assertEquals(TcTransferFrame.SequenceFlagType.LAST, fr.getSequenceFlag());
             } else {
+                assertEquals(0, (segment[0] & 0xC0) >> 6);
                 assertEquals(TcTransferFrame.SequenceFlagType.CONTINUE, fr.getSequenceFlag());
             }
             assertEquals(12, fr.getMapId());