diff --git a/src/Microsoft.ML.TensorFlow/TensorFlow/TensorflowUtils.cs b/src/Microsoft.ML.TensorFlow/TensorFlow/TensorflowUtils.cs
index 2c71d22f97..8de6347529 100644
--- a/src/Microsoft.ML.TensorFlow/TensorFlow/TensorflowUtils.cs
+++ b/src/Microsoft.ML.TensorFlow/TensorFlow/TensorflowUtils.cs
@@ -14,7 +14,7 @@
 
 namespace Microsoft.ML.Transforms.TensorFlow
 {
-    public static class TensorFlowUtils
+    internal static class TensorFlowUtils
     {
         /// <summary>
         /// Key to access operator's type (a string) in <see cref="DataViewSchema.Column.Annotations"/>.
diff --git a/src/Microsoft.ML.TensorFlow/TensorFlowModel.cs b/src/Microsoft.ML.TensorFlow/TensorFlowModel.cs
index f814e387e2..a490965805 100644
--- a/src/Microsoft.ML.TensorFlow/TensorFlowModel.cs
+++ b/src/Microsoft.ML.TensorFlow/TensorFlowModel.cs
@@ -105,7 +105,7 @@ public TensorFlowEstimator ScoreTensorFlowModel(string[] outputColumnNames, stri
         /// <remarks>
         /// The support for retraining is experimental.
         /// </remarks>
-        public TensorFlowEstimator RetrainTensorFlowModel(
+        internal TensorFlowEstimator RetrainTensorFlowModel(
             string[] outputColumnNames,
             string[] inputColumnNames,
             string labelColumnName,