diff --git a/README.md b/README.md
index 296ef3e..c55f6db 100644
--- a/README.md
+++ b/README.md
@@ -89,13 +89,7 @@ public class Startup
 	{
 		services.AddTransient<ISecurityTokenValidator, MyCustomTokenValidator>();
 		services.AddAuthentication()
-			.AddSimpleTokenAuthentication(options =>
-			{
-				options.SecurityTokenValidatorsFactory = () =>
-				{
-					return services.BuildServiceProvider().GetServices<ISecurityTokenValidator>();
-				};
-			});
+			.AddSimpleTokenAuthentication();
 	}
 
 	public void Configure(IApplicationBuilder app, ILoggerFactory loggerfactory) {
diff --git a/src/MakingSense.AspNetCore.Authentication.SimpleToken/MakingSense.AspNetCore.Authentication.SimpleToken.csproj b/src/MakingSense.AspNetCore.Authentication.SimpleToken/MakingSense.AspNetCore.Authentication.SimpleToken.csproj
index 6d171d0..9017b90 100644
--- a/src/MakingSense.AspNetCore.Authentication.SimpleToken/MakingSense.AspNetCore.Authentication.SimpleToken.csproj
+++ b/src/MakingSense.AspNetCore.Authentication.SimpleToken/MakingSense.AspNetCore.Authentication.SimpleToken.csproj
@@ -18,6 +18,7 @@
     <PackageReference Include="MakingSense.AspNetCore.Abstractions" Version="2.0.0-alpha-173" />
     <PackageReference Include="Microsoft.AspNetCore.Authentication" Version="2.0.0" />
     <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
+    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.0.0" />
     <PackageReference Include="Microsoft.IdentityModel.Tokens" Version="5.4.0" />
     <PackageReference Include="Newtonsoft.Json" Version="12.0.2" />
     <PackageReference Include="System.Linq" Version="4.3.0" />
diff --git a/src/MakingSense.AspNetCore.Authentication.SimpleToken/README.md b/src/MakingSense.AspNetCore.Authentication.SimpleToken/README.md
index 296ef3e..c55f6db 100644
--- a/src/MakingSense.AspNetCore.Authentication.SimpleToken/README.md
+++ b/src/MakingSense.AspNetCore.Authentication.SimpleToken/README.md
@@ -89,13 +89,7 @@ public class Startup
 	{
 		services.AddTransient<ISecurityTokenValidator, MyCustomTokenValidator>();
 		services.AddAuthentication()
-			.AddSimpleTokenAuthentication(options =>
-			{
-				options.SecurityTokenValidatorsFactory = () =>
-				{
-					return services.BuildServiceProvider().GetServices<ISecurityTokenValidator>();
-				};
-			});
+			.AddSimpleTokenAuthentication();
 	}
 
 	public void Configure(IApplicationBuilder app, ILoggerFactory loggerfactory) {
diff --git a/src/MakingSense.AspNetCore.Authentication.SimpleToken/SimpleTokenAuthenticationExtensions.cs b/src/MakingSense.AspNetCore.Authentication.SimpleToken/SimpleTokenAuthenticationExtensions.cs
index c19def3..e7aeccd 100644
--- a/src/MakingSense.AspNetCore.Authentication.SimpleToken/SimpleTokenAuthenticationExtensions.cs
+++ b/src/MakingSense.AspNetCore.Authentication.SimpleToken/SimpleTokenAuthenticationExtensions.cs
@@ -1,4 +1,6 @@
 using Microsoft.AspNetCore.Authentication;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.IdentityModel.Tokens;
 using System;
 
 namespace MakingSense.AspNetCore.Authentication.SimpleToken
@@ -6,7 +8,7 @@ namespace MakingSense.AspNetCore.Authentication.SimpleToken
 	public static class SimpleTokenAuthenticationExtensions
 	{
 		public static AuthenticationBuilder AddSimpleTokenAuthentication(this AuthenticationBuilder builder)
-			=> builder.AddSimpleTokenAuthentication(SimpleTokenDefaults.AuthenticationScheme, _ => { });
+			=> builder.AddSimpleTokenAuthentication(SimpleTokenDefaults.AuthenticationScheme, null);
 
 		public static AuthenticationBuilder AddSimpleTokenAuthentication(this AuthenticationBuilder builder,
 			Action<SimpleTokenAuthenticationOptions> configureOptions)
@@ -22,7 +24,28 @@ public static AuthenticationBuilder AddSimpleTokenAuthentication(this Authentica
 			string displayName,
 			Action<SimpleTokenAuthenticationOptions> configureOptions)
 		{
-			return builder.AddScheme<SimpleTokenAuthenticationOptions, SimpleTokenAuthenticationHandler>(authenticationScheme, displayName, configureOptions);
+			return builder.AddScheme<SimpleTokenAuthenticationOptions, SimpleTokenAuthenticationHandler>(authenticationScheme, displayName,
+				(SimpleTokenAuthenticationOptions options) => {
+					configureOptions?.Invoke(options);
+					
+					if (options.SecurityTokenValidatorsFactory == null)
+					{
+						options.SecurityTokenValidatorsFactory = () =>
+						{
+							// TODO: fix it because it is using app services, and it should use scope services,
+							// a work around could be:
+							// ```
+							// SecurityTokenValidatorsFactory = () =>
+							// {
+							//     var context = builder.Services.BuildServiceProvider().GetService<IHttpContextAccessor>().HttpContext;
+							//     return context.RequestServices.GetServices<ISecurityTokenValidator>();
+							// }
+							// ```
+							var serviceProvider = builder.Services.BuildServiceProvider();
+							return serviceProvider.GetServices<ISecurityTokenValidator>();
+						};
+					}
+				});
 		}
 	}
 }