diff --git a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedBrowserStorage.cs b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedBrowserStorage.cs
index 71a06a15ec..1d2610079c 100644
--- a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedBrowserStorage.cs
+++ b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedBrowserStorage.cs
@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using System.Text.Json;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.DataProtection;
@@ -11,9 +12,11 @@ using Microsoft.JSInterop;
 
 namespace Microsoft.AspNetCore.Components.Web.Extensions
 {
+
     /// <summary>
     /// Provides mechanisms for storing and retrieving data in the browser storage.
     /// </summary>
+    [UnsupportedOSPlatform("browser")]
     public abstract class ProtectedBrowserStorage
     {
         private readonly string _storeName;
diff --git a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedLocalStorage.cs b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedLocalStorage.cs
index 68229e0f18..08a529c948 100644
--- a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedLocalStorage.cs
+++ b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedLocalStorage.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Runtime.Versioning;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.JSInterop;
 
@@ -15,6 +16,7 @@ namespace Microsoft.AspNetCore.Components.Web.Extensions
     ///
     /// See: https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage
     /// </summary>
+    [UnsupportedOSPlatform("browser")]
     public class ProtectedLocalStorage : ProtectedBrowserStorage
     {
         /// <summary>
diff --git a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedSessionStorage.cs b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedSessionStorage.cs
index 452e4e2bb5..8f03d50802 100644
--- a/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedSessionStorage.cs
+++ b/src/Components/Web.Extensions/src/ProtectedBrowserStorage/ProtectedSessionStorage.cs
@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
+using System.Runtime.Versioning;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.JSInterop;
 
@@ -15,6 +16,7 @@ namespace Microsoft.AspNetCore.Components.Web.Extensions
     ///
     /// See: https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage
     /// </summary>
+    [UnsupportedOSPlatform("browser")]
     public class ProtectedSessionStorage : ProtectedBrowserStorage
     {
         /// <summary>