diff --git a/collector/pg_wal.go b/collector/pg_wal.go
index afa8fcef6..0757fd10d 100644
--- a/collector/pg_wal.go
+++ b/collector/pg_wal.go
@@ -52,10 +52,26 @@ var (
 		[]string{}, nil,
 	)
 
+	pgWALLSNInBytes = prometheus.NewDesc(
+		prometheus.BuildFQName(
+			namespace,
+			walSubsystem,
+			"lsn_location_bytes",
+		),
+		"WAL Log Sequence Number in bytes",
+		[]string{}, nil,
+	)
+
 	pgWALQuery = `
 		SELECT
 			COUNT(*) AS segments,
-			SUM(size) AS size
+			SUM(size) AS size,
+			(SELECT CASE
+			WHEN pg_is_in_recovery() THEN
+				pg_wal_lsn_diff(pg_last_wal_replay_lsn(), '0/0')::int8				
+			ELSE
+				pg_wal_lsn_diff(pg_current_wal_lsn(), '0/0')::int8
+			END) AS lsn_location_bytes
 		FROM pg_ls_waldir()
 		WHERE name ~ '^[0-9A-F]{24}$'`
 )
@@ -68,7 +84,8 @@ func (c PGWALCollector) Update(ctx context.Context, instance *instance, ch chan<
 
 	var segments uint64
 	var size uint64
-	err := row.Scan(&segments, &size)
+	var lsnbytes uint64
+	err := row.Scan(&segments, &size, &lsnbytes)
 	if err != nil {
 		return err
 	}
@@ -80,5 +97,9 @@ func (c PGWALCollector) Update(ctx context.Context, instance *instance, ch chan<
 		pgWALSize,
 		prometheus.GaugeValue, float64(size),
 	)
+	ch <- prometheus.MustNewConstMetric(
+		pgWALLSNInBytes,
+		prometheus.GaugeValue, float64(lsnbytes),
+	)
 	return nil
 }
diff --git a/collector/pg_wal_test.go b/collector/pg_wal_test.go
index 745105a13..6e88cf51e 100644
--- a/collector/pg_wal_test.go
+++ b/collector/pg_wal_test.go
@@ -31,9 +31,9 @@ func TestPgWALCollector(t *testing.T) {
 
 	inst := &instance{db: db}
 
-	columns := []string{"segments", "size"}
+	columns := []string{"segments", "size", "lsn_location_bytes"}
 	rows := sqlmock.NewRows(columns).
-		AddRow(47, 788529152)
+		AddRow(47, 788529152, 123456789)
 	mock.ExpectQuery(sanitizeQuery(pgWALQuery)).WillReturnRows(rows)
 
 	ch := make(chan prometheus.Metric)
@@ -49,6 +49,7 @@ func TestPgWALCollector(t *testing.T) {
 	expected := []MetricResult{
 		{labels: labelMap{}, value: 47, metricType: dto.MetricType_GAUGE},
 		{labels: labelMap{}, value: 788529152, metricType: dto.MetricType_GAUGE},
+		{labels: labelMap{}, value: 123456789, metricType: dto.MetricType_GAUGE},
 	}
 
 	convey.Convey("Metrics comparison", t, func() {