diff --git a/src/Umbraco.Core/AsyncLock.cs b/src/Umbraco.Core/AsyncLock.cs
index 0a9c79a80e..b4e8e64312 100644
--- a/src/Umbraco.Core/AsyncLock.cs
+++ b/src/Umbraco.Core/AsyncLock.cs
@@ -63,14 +63,14 @@ namespace Umbraco.Core
             // for anonymous semaphore, use the unique releaser, else create a new one
             return _semaphore != null
                 ? _releaser // (IDisposable)new SemaphoreSlimReleaser(_semaphore)
-                : (IDisposable)new NamedSemaphoreReleaser(_semaphore2);
+                : new NamedSemaphoreReleaser(_semaphore2);
         }
 
         public Task<IDisposable> LockAsync()
         {
             var wait = _semaphore != null 
-                ? _semaphore.WaitAsync() 
-                : WaitOneAsync(_semaphore2);
+                ? _semaphore.WaitAsync()
+                : _semaphore2.WaitOneAsync();
 
             return wait.IsCompleted 
                 ? _releaserTask ?? Task.FromResult(CreateReleaser()) // anonymous vs named
@@ -79,6 +79,19 @@ namespace Umbraco.Core
                     TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
         }
 
+        public Task<IDisposable> LockAsync(int millisecondsTimeout)
+        {
+            var wait = _semaphore != null
+                ? _semaphore.WaitAsync(millisecondsTimeout)
+                : _semaphore2.WaitOneAsync(millisecondsTimeout);
+
+            return wait.IsCompleted
+                ? _releaserTask ?? Task.FromResult(CreateReleaser()) // anonymous vs named
+                : wait.ContinueWith((_, state) => (((AsyncLock)state).CreateReleaser()),
+                    this, CancellationToken.None,
+                    TaskContinuationOptions.ExecuteSynchronously, TaskScheduler.Default);
+        }
+
         public IDisposable Lock()
         {
             if (_semaphore != null)
@@ -168,40 +181,5 @@ namespace Umbraco.Core
                 Dispose(false);
             }
         }
-
-        // http://stackoverflow.com/questions/25382583/waiting-on-a-named-semaphore-with-waitone100-vs-waitone0-task-delay100
-        // http://blog.nerdbank.net/2011/07/c-await-for-waithandle.html
-        // F# has a AwaitWaitHandle method that accepts a time out... and seems pretty complex...
-        // version below should be OK
-
-        private static Task WaitOneAsync(WaitHandle handle)
-        {
-            var tcs = new TaskCompletionSource<object>();
-            var callbackHandleInitLock = new object();
-            lock (callbackHandleInitLock)
-            {
-                RegisteredWaitHandle callbackHandle = null;
-                // ReSharper disable once RedundantAssignment
-                callbackHandle = ThreadPool.RegisterWaitForSingleObject(
-                    handle,
-                    (state, timedOut) =>
-                    {
-                        tcs.SetResult(null);
-
-                        // we take a lock here to make sure the outer method has completed setting the local variable callbackHandle.
-                        lock (callbackHandleInitLock)
-                        {
-                            // ReSharper disable once PossibleNullReferenceException
-                            // ReSharper disable once AccessToModifiedClosure
-                            callbackHandle.Unregister(null);
-                        }
-                    },
-                    /*state:*/ null,
-                    /*millisecondsTimeOutInterval:*/ Timeout.Infinite,
-                    /*executeOnlyOnce:*/ true);
-            }
-
-            return tcs.Task;
-        }
     }
 }
\ No newline at end of file
diff --git a/src/Umbraco.Core/Umbraco.Core.csproj b/src/Umbraco.Core/Umbraco.Core.csproj
index 4e155e1b3d..5d5bb9807f 100644
--- a/src/Umbraco.Core/Umbraco.Core.csproj
+++ b/src/Umbraco.Core/Umbraco.Core.csproj
@@ -1215,6 +1215,7 @@
     <Compile Include="UriExtensions.cs" />
     <Compile Include="SystemUtilities.cs" />
     <Compile Include="UrlHelperExtensions.cs" />
+    <Compile Include="WaitHandleExtensions.cs" />
     <Compile Include="WriteLock.cs" />
     <Compile Include="XmlExtensions.cs" />
     <Compile Include="XmlHelper.cs" />
diff --git a/src/Umbraco.Core/WaitHandleExtensions.cs b/src/Umbraco.Core/WaitHandleExtensions.cs
new file mode 100644
index 0000000000..0d840a2496
--- /dev/null
+++ b/src/Umbraco.Core/WaitHandleExtensions.cs
@@ -0,0 +1,44 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Umbraco.Core
+{
+    internal static class WaitHandleExtensions
+    {
+
+        // http://stackoverflow.com/questions/25382583/waiting-on-a-named-semaphore-with-waitone100-vs-waitone0-task-delay100
+        // http://blog.nerdbank.net/2011/07/c-await-for-waithandle.html
+        // F# has a AwaitWaitHandle method that accepts a time out... and seems pretty complex...
+        // version below should be OK
+
+        public static Task WaitOneAsync(this WaitHandle handle, int millisecondsTimeout = Timeout.Infinite)
+        {
+            var tcs = new TaskCompletionSource<object>();
+            var callbackHandleInitLock = new object();
+            lock (callbackHandleInitLock)
+            {
+                RegisteredWaitHandle callbackHandle = null;
+                // ReSharper disable once RedundantAssignment
+                callbackHandle = ThreadPool.RegisterWaitForSingleObject(
+                    handle,
+                    (state, timedOut) =>
+                    {
+                        tcs.SetResult(null);
+
+                        // we take a lock here to make sure the outer method has completed setting the local variable callbackHandle.
+                        lock (callbackHandleInitLock)
+                        {
+                            // ReSharper disable once PossibleNullReferenceException
+                            // ReSharper disable once AccessToModifiedClosure
+                            callbackHandle.Unregister(null);
+                        }
+                    },
+                    /*state:*/ null,
+                    /*millisecondsTimeOutInterval:*/ millisecondsTimeout,
+                    /*executeOnlyOnce:*/ true);
+            }
+
+            return tcs.Task;
+        }
+    }
+}