diff --git a/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/BoosterParams.scala b/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/BoosterParams.scala
index c01b31140..6e980f8aa 100644
--- a/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/BoosterParams.scala
+++ b/jvm-packages/xgboost4j-spark/src/main/scala/ml/dmlc/xgboost4j/scala/spark/params/BoosterParams.scala
@@ -154,7 +154,7 @@ trait BoosterParams extends Params {
 
   /**
    * Control the balance of positive and negative weights, useful for unbalanced classes. A typical
-   * value to consider: sum(negative cases) / sum(positive cases).   [default=0]
+   * value to consider: sum(negative cases) / sum(positive cases).   [default=1]
    */
   val scalePosWeight = new DoubleParam(this, "scale_pos_weight", "Control the balance of positive" +
     " and negative weights, useful for unbalanced classes. A typical value to consider:" +
diff --git a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/XGBoostSparkPipelinePersistence.scala b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/XGBoostSparkPipelinePersistence.scala
index 031a68271..f984a9da3 100644
--- a/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/XGBoostSparkPipelinePersistence.scala
+++ b/jvm-packages/xgboost4j-spark/src/test/scala/ml/dmlc/xgboost4j/scala/spark/XGBoostSparkPipelinePersistence.scala
@@ -90,7 +90,7 @@ class XGBoostSparkPipelinePersistence extends FunSuite with PerTest
       .setInputCols(df.columns
         .filter(!_.contains("label")))
       .setOutputCol("features")
-    val xgbEstimator = new XGBoostEstimator(Map("num_rounds" -> 10,
+    val xgbEstimator = new XGBoostEstimator(Map("num_round" -> 10,
       "tracker_conf" -> TrackerConf(60 * 60 * 1000, "scala")
     )).setFeaturesCol("features").setLabelCol("label")
     // separate