diff --git a/internal/congestion/cubic_sender.go b/internal/congestion/cubic_sender.go
index 087cf9294..20a75af26 100644
--- a/internal/congestion/cubic_sender.go
+++ b/internal/congestion/cubic_sender.go
@@ -83,7 +83,7 @@ func newCubicSender(clock Clock, rttStats *utils.RTTStats, reno bool, initialCon
 		initialMaxCongestionWindow: initialMaxCongestionWindow,
 		congestionWindow:           initialCongestionWindow,
 		minCongestionWindow:        minCongestionWindow,
-		slowStartThreshold:         initialMaxCongestionWindow,
+		slowStartThreshold:         protocol.MaxByteCount,
 		maxCongestionWindow:        initialMaxCongestionWindow,
 		cubic:                      NewCubic(clock),
 		clock:                      clock,
diff --git a/internal/congestion/cubic_sender_test.go b/internal/congestion/cubic_sender_test.go
index 83b4a7002..6836ea99d 100644
--- a/internal/congestion/cubic_sender_test.go
+++ b/internal/congestion/cubic_sender_test.go
@@ -289,7 +289,7 @@ var _ = Describe("Cubic Sender", func() {
 
 	It("RTO congestion window", func() {
 		Expect(sender.GetCongestionWindow()).To(Equal(defaultWindowTCP))
-		Expect(sender.slowStartThreshold).To(Equal(MaxCongestionWindow))
+		Expect(sender.slowStartThreshold).To(Equal(protocol.MaxByteCount))
 
 		// Expect the window to decrease to the minimum once the RTO fires
 		// and slow start threshold to be set to 1/2 of the CWND.
@@ -420,7 +420,7 @@ var _ = Describe("Cubic Sender", func() {
 
 	It("reset after connection migration", func() {
 		Expect(sender.GetCongestionWindow()).To(Equal(defaultWindowTCP))
-		Expect(sender.slowStartThreshold).To(Equal(MaxCongestionWindow))
+		Expect(sender.slowStartThreshold).To(Equal(protocol.MaxByteCount))
 
 		// Starts with slow start.
 		const numberOfAcks = 10