diff --git a/config/config_test.go b/config/config_test.go
index 08aa0b4f06..968b563e1e 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -1733,8 +1733,9 @@ var expectedConf = &Config{
 	},
 	StorageConfig: StorageConfig{
 		TSDBConfig: &TSDBConfig{
-			OutOfOrderTimeWindow:     30 * time.Minute.Milliseconds(),
-			OutOfOrderTimeWindowFlag: model.Duration(30 * time.Minute),
+			OutOfOrderTimeWindow:           30 * time.Minute.Milliseconds(),
+			OutOfOrderTimeWindowFlag:       model.Duration(30 * time.Minute),
+			StaleSeriesCompactionThreshold: 0.5,
 			Retention: &TSDBRetentionConfig{
 				Time: model.Duration(24 * time.Hour),
 				Size: 1 * units.GiB,
diff --git a/config/testdata/conf.good.yml b/config/testdata/conf.good.yml
index 7aa53b3b74..96bf9e2b33 100644
--- a/config/testdata/conf.good.yml
+++ b/config/testdata/conf.good.yml
@@ -453,6 +453,7 @@ alerting:
 storage:
   tsdb:
     out_of_order_time_window: 30m
+    stale_series_compaction_threshold: 0.5
     retention:
       time: 1d
       size: 1GB