diff --git a/src/internet/model/tcp-socket-base.cc b/src/internet/model/tcp-socket-base.cc
index f31398cb5..7370a2751 100644
--- a/src/internet/model/tcp-socket-base.cc
+++ b/src/internet/model/tcp-socket-base.cc
@@ -1929,6 +1929,12 @@ TcpSocketBase::SendDataPacket (SequenceNumber32 seq, uint32_t maxSize, bool with
   uint8_t flags = withAck ? TcpHeader::ACK : 0;
   uint32_t remainingData = m_txBuffer->SizeFromSequence (seq + SequenceNumber32 (sz));
 
+  if (withAck)
+    {
+      m_delAckEvent.Cancel ();
+      m_delAckCount = 0;
+    }
+
   /*
    * Add tags for each socket option.
    * Note that currently the socket adds both IPv4 tag and IPv6 tag