diff --git a/libraries/networking/src/udt/CongestionControl.h b/libraries/networking/src/udt/CongestionControl.h
index 5fd784cc20..69b7a32d2d 100644
--- a/libraries/networking/src/udt/CongestionControl.h
+++ b/libraries/networking/src/udt/CongestionControl.h
@@ -115,7 +115,6 @@ private:
     p_high_resolution_clock::time_point _lastRCTime = p_high_resolution_clock::now(); // last rate increase time
     
     bool _slowStart { true };	// if in slow start phase
-    bool _hasSetSlowStartACK { false }; // flag to signal if slow start ACK has been set with handshake sequence number
     SequenceNumber _slowStartLastACK; // last ACKed seq num from previous slow start check
     bool _loss { false };	// if loss happened since last rate increase
     SequenceNumber _lastDecreaseMaxSeq; // max pkt seq num sent out when last decrease happened