diff --git a/src/NServiceBus.IntegrationTesting/IntegrationContext.cs b/src/NServiceBus.IntegrationTesting/IntegrationContext.cs
index dd937a2a..1f6ad968 100644
--- a/src/NServiceBus.IntegrationTesting/IntegrationContext.cs
+++ b/src/NServiceBus.IntegrationTesting/IntegrationContext.cs
@@ -1,4 +1,5 @@
 using NServiceBus.AcceptanceTesting;
+using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.Linq;
 using System.Reflection;
@@ -7,9 +8,11 @@ namespace NServiceBus.IntegrationTesting
 {
     public class IntegrationContext : ScenarioContext
     {
-        List<HandlerInvocation> invokedHandlers = new List<HandlerInvocation>();
+        readonly ConcurrentBag<HandlerInvocation> invokedHandlers = new ConcurrentBag<HandlerInvocation>();
+        readonly ConcurrentBag<SagaInvocation> invokedSagas = new ConcurrentBag<SagaInvocation>();
 
         public IEnumerable<HandlerInvocation> InvokedHandlers { get { return invokedHandlers; } }
+        public IEnumerable<SagaInvocation> InvokedSagas { get { return invokedSagas; } }
 
         internal HandlerInvocation CaptureInvokedHandler(HandlerInvocation invocation)
         {
@@ -18,11 +21,6 @@ internal HandlerInvocation CaptureInvokedHandler(HandlerInvocation invocation)
             return invocation;
         }
 
-        List<SagaInvocation> invokedSagas = new List<SagaInvocation>();
-
-        public IEnumerable<SagaInvocation> InvokedSagas { get { return invokedSagas; } }
-
-
         internal SagaInvocation CaptureInvokedSaga(SagaInvocation invocation)
         {
             invokedSagas.Add(invocation);
@@ -30,7 +28,7 @@ internal SagaInvocation CaptureInvokedSaga(SagaInvocation invocation)
             return invocation;
         }
 
-        static PropertyInfo GetCurrentProperty()
+        static PropertyInfo GetScenarioContextCurrentProperty()
         {
             return typeof(ScenarioContext).GetProperty("Current", BindingFlags.Static | BindingFlags.NonPublic);
         }
@@ -39,7 +37,7 @@ public static IntegrationContext CurrentContext
         {
             get
             {
-                var pi = GetCurrentProperty();
+                var pi = GetScenarioContextCurrentProperty();
                 var current = (IntegrationContext)pi.GetMethod.Invoke(null, null);
 
                 return current;