diff --git a/LightweightIocContainer/IocContainer.cs b/LightweightIocContainer/IocContainer.cs
index 7ed4cd6..b4ac730 100644
--- a/LightweightIocContainer/IocContainer.cs
+++ b/LightweightIocContainer/IocContainer.cs
@@ -3,7 +3,6 @@
 // Copyright(c) 2019 SimonG. All Rights Reserved.
 
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using LightweightIocContainer.Exceptions;
 using LightweightIocContainer.Interfaces;
 using LightweightIocContainer.Interfaces.Factories;
@@ -23,7 +22,7 @@ public class IocContainer : IIocContainer, IIocResolver
     private readonly RegistrationFactory _registrationFactory;
 
     private readonly List<(Type type, object? instance)> _singletons = new();
-    private readonly List<(Type type, Type scope, ConditionalWeakTable<object, object?> instances)> _multitons = new();
+    private readonly List<(Type type, Type scope, Dictionary<object, object?> instances)> _multitons = new();
 
     private readonly List<Type> _ignoreConstructorAttributes;
 
@@ -421,7 +420,7 @@ public class IocContainer : IIocContainer, IIocResolver
         }
 
         T newInstance = Creator.CreateInstance<T>(registration.ImplementationType, arguments[1..]);
-        _multitons.Add((registration.ImplementationType, registration.Scope, new ConditionalWeakTable<object, object?> { { scopeArgument, newInstance } }));
+        _multitons.Add((registration.ImplementationType, registration.Scope, new Dictionary<object, object?> { { scopeArgument, newInstance } }));
 
         return newInstance;
     }
diff --git a/Test.LightweightIocContainer/IocContainerTest.cs b/Test.LightweightIocContainer/IocContainerTest.cs
index ebc4a0a..bf42f55 100644
--- a/Test.LightweightIocContainer/IocContainerTest.cs
+++ b/Test.LightweightIocContainer/IocContainerTest.cs
@@ -34,6 +34,11 @@ public class IocContainerTest
             
         }
     }
+    
+    private class TestMultitonIntScope(int scope) : ITest
+    {
+        
+    }
 
     [UsedImplicitly]
     private class TestConstructor : ITest
@@ -269,6 +274,20 @@ public class IocContainerTest
         Assert.AreNotSame(resolvedTest1, resolvedTest3);
         Assert.AreNotSame(resolvedTest2, resolvedTest3);
     }
+    
+    [Test]
+    public void TestResolveMultitonIntScope()
+    {
+        _iocContainer.Register(r => r.AddMultiton<ITest, TestMultitonIntScope, int>());
+
+        ITest resolvedTest1 = _iocContainer.Resolve<ITest>(1);
+        ITest resolvedTest2 = _iocContainer.Resolve<ITest>(1);
+        ITest resolvedTest3 = _iocContainer.Resolve<ITest>(2);
+
+        Assert.AreSame(resolvedTest1, resolvedTest2);
+        Assert.AreNotSame(resolvedTest1, resolvedTest3);
+        Assert.AreNotSame(resolvedTest2, resolvedTest3);
+    }
 
     [Test]
     public void TestResolveMultitonNoArgs()