diff --git a/src/mscorlib/src/System/Threading/ThreadPool.cs b/src/mscorlib/src/System/Threading/ThreadPool.cs
index f9d8e7da98e0..1fdfc017d0e4 100644
--- a/src/mscorlib/src/System/Threading/ThreadPool.cs
+++ b/src/mscorlib/src/System/Threading/ThreadPool.cs
@@ -56,11 +56,12 @@ internal static class ThreadPoolGlobals
         public static bool enableWorkerTracking;
 
         [SecurityCritical]
-        public static ThreadPoolWorkQueue workQueue = new ThreadPoolWorkQueue();
+        public static ThreadPoolWorkQueue workQueue;
 
-        [System.Security.SecuritySafeCritical] // static constructors should be safe to call
-        static ThreadPoolGlobals()
+        [SecurityCritical]
+        internal static void Initialize()
         {
+            workQueue = new ThreadPoolWorkQueue();
         }
     }
 
@@ -1168,9 +1169,6 @@ internal interface IThreadPoolWorkItem
 
     internal sealed class QueueUserWorkItemCallback : IThreadPoolWorkItem
     {
-        [System.Security.SecuritySafeCritical]
-        static QueueUserWorkItemCallback() {}
-
         private WaitCallback callback;
         private ExecutionContext context;
         private Object state;
@@ -1232,7 +1230,13 @@ void IThreadPoolWorkItem.MarkAborted(ThreadAbortException tae)
         }
 
         [System.Security.SecurityCritical]
-        static internal ContextCallback ccb = new ContextCallback(WaitCallback_Context);
+        static internal ContextCallback ccb;
+
+        [System.Security.SecurityCritical]
+        static internal void Initialize()
+        {
+            ccb = new ContextCallback(WaitCallback_Context);
+        }
 
         [System.Security.SecurityCritical]
         static private void WaitCallback_Context(Object state)
@@ -1298,7 +1302,13 @@ void IThreadPoolWorkItem.MarkAborted(ThreadAbortException tae)
         }
 
         [System.Security.SecurityCritical]
-        static internal ContextCallback ccb = new ContextCallback(WaitCallback_Context);
+        static internal ContextCallback ccb;
+
+        [System.Security.SecurityCritical]
+        static internal void Initialize()
+        {
+            ccb = new ContextCallback(WaitCallback_Context);
+        }
 
         [System.Security.SecurityCritical]
         static private void WaitCallback_Context(Object state)
@@ -1313,16 +1323,20 @@ static private void WaitCallback_Context(Object state)
 
     internal class _ThreadPoolWaitOrTimerCallback
     {
-        [System.Security.SecuritySafeCritical]
-        static _ThreadPoolWaitOrTimerCallback() {}
-
         WaitOrTimerCallback _waitOrTimerCallback;
         ExecutionContext _executionContext;
         Object _state;
         [System.Security.SecurityCritical]
-        static private ContextCallback _ccbt = new ContextCallback(WaitOrTimerCallback_Context_t);
+        static private ContextCallback _ccbt;
         [System.Security.SecurityCritical]
-        static private ContextCallback _ccbf = new ContextCallback(WaitOrTimerCallback_Context_f);
+        static private ContextCallback _ccbf;
+
+        [System.Security.SecurityCritical]
+        static internal void Initialize()
+        {
+            _ccbt = new ContextCallback(WaitOrTimerCallback_Context_t);
+            _ccbf = new ContextCallback(WaitOrTimerCallback_Context_f);
+        }
 
         [System.Security.SecurityCritical]  // auto-generated
         internal _ThreadPoolWaitOrTimerCallback(WaitOrTimerCallback waitOrTimerCallback, Object state, bool compressStack, ref StackCrawlMark stackMark)
@@ -1845,6 +1859,12 @@ private static void EnsureVMInitialized()
             if (!ThreadPoolGlobals.vmTpInitialized)
             {
                 ThreadPool.InitializeVMTp(ref ThreadPoolGlobals.enableWorkerTracking);
+
+                ThreadPoolGlobals.Initialize();
+                QueueUserWorkItemCallback.Initialize();
+                QueueUserWorkItemCallbackDefaultContext.Initialize();
+                _ThreadPoolWaitOrTimerCallback.Initialize();
+
                 ThreadPoolGlobals.vmTpInitialized = true;
             }
         }