diff --git a/AutofacContrib.NSubstitute.Tests/AutofacContrib.NSubstitute.Tests.csproj b/AutofacContrib.NSubstitute.Tests/AutofacContrib.NSubstitute.Tests.csproj
index 71c7358..6797d50 100644
--- a/AutofacContrib.NSubstitute.Tests/AutofacContrib.NSubstitute.Tests.csproj
+++ b/AutofacContrib.NSubstitute.Tests/AutofacContrib.NSubstitute.Tests.csproj
@@ -55,6 +55,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="AutoSubstituteFixture.cs" />
+    <Compile Include="KeyedRegistrationFixture.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="ExampleFixture.cs" />
   </ItemGroup>
diff --git a/AutofacContrib.NSubstitute.Tests/KeyedRegistrationFixture.cs b/AutofacContrib.NSubstitute.Tests/KeyedRegistrationFixture.cs
new file mode 100644
index 0000000..c7fa461
--- /dev/null
+++ b/AutofacContrib.NSubstitute.Tests/KeyedRegistrationFixture.cs
@@ -0,0 +1,63 @@
+using Autofac.Features.Indexed;
+using NSubstitute;
+using NUnit.Framework;
+
+namespace AutofacContrib.NSubstitute.Tests
+{
+    public enum Switch
+    {
+        Off,
+        On
+    }
+
+    public class ClassWithKeyedDependencies
+    {
+        public ClassWithKeyedDependencies(IIndex<Switch, IDependency2> dependencies)
+        {
+            OnDependency = dependencies[Switch.On];
+            OffDependency = dependencies[Switch.Off];
+        }
+
+        public IDependency2 OnDependency { get; private set; }
+        public IDependency2 OffDependency { get; private set; }
+    }
+
+    public static class KeyedRegistrationFixture
+    {
+        [Test]
+        public static void ShouldResolveIndexedDependencies()
+        {
+            var autoSubstitute = new AutoSubstitute();
+
+            var target = autoSubstitute.Resolve<ClassWithKeyedDependencies>();
+
+            Assert.NotNull(target.OnDependency);
+            Assert.NotNull(target.OffDependency);
+        }
+
+        [Test]
+        public static void ShouldResolveASubstituteForIndexedDependency()
+        {
+            var autoSubstitute = new AutoSubstitute();
+            var index = autoSubstitute.Resolve<IIndex<Switch, IDependency2>>();
+            index[Switch.On].SomeOtherMethod().Returns(5);
+
+            var target = autoSubstitute.Resolve<ClassWithKeyedDependencies>();
+
+            Assert.That(target.OnDependency.SomeOtherMethod(), Is.EqualTo(5));
+        }
+
+        [Test]
+        public static void ShouldAcceptProvidedIndexedDependency()
+        {
+            var autoSubstitute = new AutoSubstitute();
+            var substitute = Substitute.For<IDependency2>();
+            substitute.SomeOtherMethod().Returns(5);
+            autoSubstitute.Provide(substitute, Switch.On);
+            
+            var target = autoSubstitute.Resolve<ClassWithKeyedDependencies>();
+
+            Assert.That(target.OnDependency.SomeOtherMethod(), Is.EqualTo(5));
+        }
+    }
+}
diff --git a/AutofacContrib.NSubstitute/AutoSubstitute.cs b/AutofacContrib.NSubstitute/AutoSubstitute.cs
index 069526f..95bccd1 100644
--- a/AutofacContrib.NSubstitute/AutoSubstitute.cs
+++ b/AutofacContrib.NSubstitute/AutoSubstitute.cs
@@ -100,6 +100,23 @@ public TService Provide<TService>(TService instance)
             return Container.Resolve<TService>();
         }
 
+        /// <summary>
+        /// Register the specified object to the container as the specified keyed service type and resolve it.
+        /// </summary>
+        /// <typeparam name="TService">The type to register the object as</typeparam>
+        /// <param name="instance">The object to register into the container</param>
+        /// <param name="serviceKey">The key to register the service with</param>
+        /// <returns>The instance resolved from container</returns>
+        public TService Provide<TService>(TService instance, object serviceKey)
+            where TService : class
+        {
+            Container.ComponentRegistry.Register(RegistrationBuilder.ForDelegate((c, p) => instance).As(new KeyedService(serviceKey, typeof(TService)))
+                .InstancePerLifetimeScope().CreateRegistration()
+            );
+
+            return Container.Resolve<TService>();
+        }
+
         /// <summary>
         /// Registers to the container and returns a substitute for a given concrete class given the explicit constructor parameters.
         /// This is used for concrete classes where NSubstitutes won't be created by default by the container when using Resolve.
diff --git a/AutofacContrib.NSubstitute/NSubstituteRegistrationHandler.cs b/AutofacContrib.NSubstitute/NSubstituteRegistrationHandler.cs
index 387bc15..ffb62a8 100644
--- a/AutofacContrib.NSubstitute/NSubstituteRegistrationHandler.cs
+++ b/AutofacContrib.NSubstitute/NSubstituteRegistrationHandler.cs
@@ -1,9 +1,11 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using Autofac;
 using Autofac.Builder;
 using Autofac.Core;
+using Autofac.Features.Indexed;
 using NSubstitute;
 
 namespace AutofacContrib.NSubstitute
@@ -25,8 +27,8 @@ public IEnumerable<IComponentRegistration> RegistrationsFor
         {
             if (service == null)
                 throw new ArgumentNullException("service");
-
-            var typedService = service as TypedService;
+            
+            var typedService = service as IServiceWithType;
             if (typedService == null ||
                 !typedService.ServiceType.IsInterface ||
                 typedService.ServiceType.IsGenericType && typedService.ServiceType.GetGenericTypeDefinition() == typeof(IEnumerable<>) ||