diff --git a/srtcore/core.cpp b/srtcore/core.cpp
index 811fd6c94..873b6ad6f 100644
--- a/srtcore/core.cpp
+++ b/srtcore/core.cpp
@@ -6493,6 +6493,8 @@ int srt::CUDT::sndDropTooLate()
     if (dpkts <= 0)
         return 0;
 
+    m_iFlowWindowSize = m_iFlowWindowSize + dpkts;
+
     // If some packets were dropped update stats, socket state, loss list and the parent group if any.
     enterCS(m_StatsLock);
     m_stats.sndr.dropped.count(stats::BytesPackets((uint64_t) dbytes, (uint32_t) dpkts));