diff --git a/src/TensorFlowNET.Core/Util/RuntimeHelpers.cs b/src/TensorFlowNET.Core/Util/RuntimeHelpers.cs
index 4e0c28b1..22f158c4 100644
--- a/src/TensorFlowNET.Core/Util/RuntimeHelpers.cs
+++ b/src/TensorFlowNET.Core/Util/RuntimeHelpers.cs
@@ -1,6 +1,6 @@
 namespace System.Runtime.CompilerServices
 {
-    public static class RuntimeHelpers
+    internal static class RuntimeHelpers
     {
         /// <summary>
         /// Slices the specified array using the specified range.
diff --git a/src/TensorFlowNET.Keras/Utils/RuntimeHelpers.cs b/src/TensorFlowNET.Keras/Utils/RuntimeHelpers.cs
index 4e0c28b1..22f158c4 100644
--- a/src/TensorFlowNET.Keras/Utils/RuntimeHelpers.cs
+++ b/src/TensorFlowNET.Keras/Utils/RuntimeHelpers.cs
@@ -1,6 +1,6 @@
 namespace System.Runtime.CompilerServices
 {
-    public static class RuntimeHelpers
+    internal static class RuntimeHelpers
     {
         /// <summary>
         /// Slices the specified array using the specified range.