diff --git a/r5dev/common/protocol.h b/r5dev/common/protocol.h
index 73beca64..7610e7c1 100644
--- a/r5dev/common/protocol.h
+++ b/r5dev/common/protocol.h
@@ -47,4 +47,5 @@ enum class PERSISTENCE : int
 #define PACKET_FLAG_ENCRYPTED			(1<<2)  // packet is encrypted
 #define PACKET_FLAG_SPLIT				(1<<3)  // packet is split
 #define PACKET_FLAG_CHOKED				(1<<4)  // packet was choked by sender
-
+#define PACKET_FLAG_PRESCALED			(1<<5)  // packet was sent by sender with prescaled frame time
+#define PACKET_FLAG_LOOPBACK			(1<<6)  // packet was sent from loopback connection
diff --git a/r5dev/engine/net_chan.h b/r5dev/engine/net_chan.h
index 4e32607d..11aadac9 100644
--- a/r5dev/engine/net_chan.h
+++ b/r5dev/engine/net_chan.h
@@ -174,7 +174,7 @@ public:
 	int                 m_nInSequenceNr;
 	int                 m_nOutSequenceNrAck;
 	int                 m_nChokedPackets;
-	int                 unknown_challenge_var;
+	int                 m_nRealTimePackets; // Number of packets without prescaled frame times.
 
 private:
 #if defined (GAMEDLL_S0) || defined (GAMEDLL_S1) || defined (GAMEDLL_S2)