diff --git a/gbn/gbn_server.go b/gbn/gbn_server.go
index 0f8116d..dc53ca9 100644
--- a/gbn/gbn_server.go
+++ b/gbn/gbn_server.go
@@ -84,6 +84,7 @@ func (g *GoBackNConn) serverHandshake() error { // nolint:gocyclo
 	var n uint8
 	var resent bool
 
+handshakeLoop:
 	for {
 		g.log.Debugf("Waiting for client SYN")
 		select {
@@ -111,6 +112,24 @@ func (g *GoBackNConn) serverHandshake() error { // nolint:gocyclo
 
 		switch msg.(type) {
 		case *PacketSYN:
+
+		case *PacketSYNACK, *PacketData:
+			// If we receive a SYNACK or DATA packet after we have
+			// restarted the handshake, we can be sure that the
+			// client has received our SYN and has completed the
+			// handshake. We can therefore complete the handshake
+			// ourselves.
+			if resent {
+				g.log.Tracef("Received %T after restarting "+
+					"handshake", msg)
+				g.timeoutManager.Received(msg)
+
+				break handshakeLoop
+			}
+
+			g.log.Tracef("Expected SYN, got %T", msg)
+
+			continue
 		default:
 			g.log.Tracef("Expected SYN, got %T", msg)
 			continue
@@ -169,6 +188,8 @@ func (g *GoBackNConn) serverHandshake() error { // nolint:gocyclo
 
 		switch msg.(type) {
 		case *PacketSYNACK:
+			g.log.Debugf("Received SYNACK")
+
 			// Notify the timeout manager we've received the SYNACK
 			// response from the counterparty.
 			g.timeoutManager.Received(msg)
@@ -185,8 +206,6 @@ func (g *GoBackNConn) serverHandshake() error { // nolint:gocyclo
 		break
 	}
 
-	g.log.Debugf("Received SYNACK")
-
 	// Set all variables that are dependent on the value of N that we get
 	// from the client
 	g.setN(n)