diff --git a/qlog/event.go b/qlog/event.go
index 1986315e8..612103cd7 100644
--- a/qlog/event.go
+++ b/qlog/event.go
@@ -328,13 +328,15 @@ type eventTransportParameters struct {
 	SentBy protocol.Perspective
 
 	OriginalDestinationConnectionID protocol.ConnectionID
-	StatelessResetToken             *[16]byte
-	DisableActiveMigration          bool
-	MaxIdleTimeout                  time.Duration
-	MaxUDPPayloadSize               protocol.ByteCount
-	AckDelayExponent                uint8
-	MaxAckDelay                     time.Duration
-	ActiveConnectionIDLimit         uint64
+	InitialSourceConnectionID       protocol.ConnectionID
+
+	StatelessResetToken     *[16]byte
+	DisableActiveMigration  bool
+	MaxIdleTimeout          time.Duration
+	MaxUDPPayloadSize       protocol.ByteCount
+	AckDelayExponent        uint8
+	MaxAckDelay             time.Duration
+	ActiveConnectionIDLimit uint64
 
 	InitialMaxData                 protocol.ByteCount
 	InitialMaxStreamDataBidiLocal  protocol.ByteCount
@@ -358,6 +360,7 @@ func (e eventTransportParameters) MarshalJSONObject(enc *gojay.Encoder) {
 			enc.StringKey("stateless_reset_token", fmt.Sprintf("%x", e.StatelessResetToken[:]))
 		}
 	}
+	enc.StringKey("initial_source_connection_id", connectionID(e.InitialSourceConnectionID).String())
 	enc.BoolKey("disable_active_migration", e.DisableActiveMigration)
 	enc.FloatKeyOmitEmpty("max_idle_timeout", milliseconds(e.MaxIdleTimeout))
 	enc.Uint64KeyNullEmpty("max_udp_payload_size", uint64(e.MaxUDPPayloadSize))
diff --git a/qlog/qlog.go b/qlog/qlog.go
index cdea9179d..0f6bbf904 100644
--- a/qlog/qlog.go
+++ b/qlog/qlog.go
@@ -179,6 +179,7 @@ func (t *tracer) recordTransportParameters(sentBy protocol.Perspective, tp *wire
 		Owner:                           owner,
 		SentBy:                          sentBy,
 		OriginalDestinationConnectionID: tp.OriginalDestinationConnectionID,
+		InitialSourceConnectionID:       tp.InitialSourceConnectionID,
 		StatelessResetToken:             tp.StatelessResetToken,
 		DisableActiveMigration:          tp.DisableActiveMigration,
 		MaxIdleTimeout:                  tp.MaxIdleTimeout,
diff --git a/qlog/qlog_test.go b/qlog/qlog_test.go
index 4ea4ad1ba..251374431 100644
--- a/qlog/qlog_test.go
+++ b/qlog/qlog_test.go
@@ -184,6 +184,7 @@ var _ = Describe("Tracer", func() {
 				MaxIdleTimeout:                  321 * time.Millisecond,
 				StatelessResetToken:             &[16]byte{0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0x00},
 				OriginalDestinationConnectionID: protocol.ConnectionID{0xde, 0xad, 0xc0, 0xde},
+				InitialSourceConnectionID:       protocol.ConnectionID{0xde, 0xad, 0xbe, 0xef},
 				ActiveConnectionIDLimit:         7,
 			})
 			entry := exportAndParseSingle()
@@ -193,6 +194,7 @@ var _ = Describe("Tracer", func() {
 			ev := entry.Event
 			Expect(ev).To(HaveKeyWithValue("owner", "local"))
 			Expect(ev).To(HaveKeyWithValue("original_destination_connection_id", "deadc0de"))
+			Expect(ev).To(HaveKeyWithValue("initial_source_connection_id", "deadbeef"))
 			Expect(ev).To(HaveKeyWithValue("stateless_reset_token", "112233445566778899aabbccddeeff00"))
 			Expect(ev).To(HaveKeyWithValue("max_idle_timeout", float64(321)))
 			Expect(ev).To(HaveKeyWithValue("max_udp_payload_size", float64(1234)))