diff --git a/Streaming.cpp b/Streaming.cpp
index f597014c..fc4e8e99 100644
--- a/Streaming.cpp
+++ b/Streaming.cpp
@@ -183,13 +183,29 @@ namespace stream
 	void Stream::ProcessAck (Packet * packet)
 	{
 		uint32_t ackThrough = packet->GetAckThrough ();
-		// TODO: handle NACKs
+		int nackCount = packet->GetNACKCount ();
 		for (auto it = m_SentPackets.begin (); it != m_SentPackets.end ();)
 		{			
-			if ((*it)->GetSeqn () <= ackThrough)
+			auto seqn = (*it)->GetSeqn ();
+			if (seqn <= ackThrough)
 			{
+				if (nackCount > 0)
+				{
+					bool nacked = false;
+					for (int i = 0; i < nackCount; i++)
+						if (seqn == packet->GetNACK (i))
+						{
+							nacked = true;
+							break;
+						}
+					if (nacked)
+					{
+						LogPrint ("Packet ", seqn, " NACK");
+						continue;
+					}	
+				}
 				auto sentPacket = *it;
-				LogPrint ("Packet ", sentPacket->GetSeqn (), " acknowledged");
+				LogPrint ("Packet ", seqn, " acknowledged");
 				m_SentPackets.erase (it++);
 				delete sentPacket;	
 			}
diff --git a/Streaming.h b/Streaming.h
index b561fc5a..86e80aef 100644
--- a/Streaming.h
+++ b/Streaming.h
@@ -54,6 +54,7 @@ namespace stream
 		uint32_t GetSeqn () const { return be32toh (*(uint32_t *)(buf + 8)); };
 		uint32_t GetAckThrough () const { return be32toh (*(uint32_t *)(buf + 12)); };
 		uint8_t GetNACKCount () const { return buf[16]; };
+		uint32_t GetNACK (int i) const { return be32toh (((uint32_t *)(buf + 17))[i]); };
 		const uint8_t * GetOption () const { return buf + 17 + GetNACKCount ()*4 + 3; }; // 3 = resendDelay + flags
 		uint16_t GetFlags () const { return be16toh (*(uint16_t *)(GetOption () - 2)); };
 		uint16_t GetOptionSize () const { return be16toh (*(uint16_t *)GetOption ()); };