diff --git a/src/Microsoft.ML.AutoML/SweepableEstimator/Estimators/FastForest.cs b/src/Microsoft.ML.AutoML/SweepableEstimator/Estimators/FastForest.cs
index c9e900f023..56bb421c88 100644
--- a/src/Microsoft.ML.AutoML/SweepableEstimator/Estimators/FastForest.cs
+++ b/src/Microsoft.ML.AutoML/SweepableEstimator/Estimators/FastForest.cs
@@ -13,6 +13,7 @@ public override IEstimator<ITransformer> BuildFromOption(MLContext context, Fast
             var option = new FastForestBinaryTrainer.Options()
             {
                 NumberOfTrees = param.NumberOfTrees,
+                NumberOfLeaves = param.NumberOfLeaves,
                 LabelColumnName = param.LabelColumnName,
                 FeatureColumnName = param.FeatureColumnName,
                 ExampleWeightColumnName = param.ExampleWeightColumnName,
@@ -31,6 +32,7 @@ public override IEstimator<ITransformer> BuildFromOption(MLContext context, Fast
             var option = new FastForestRegressionTrainer.Options()
             {
                 NumberOfTrees = param.NumberOfTrees,
+                NumberOfLeaves = param.NumberOfLeaves,
                 FeatureFraction = param.FeatureFraction,
                 LabelColumnName = param.LabelColumnName,
                 FeatureColumnName = param.FeatureColumnName,