diff --git a/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolCallbackWrapper.cs b/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolCallbackWrapper.cs
index 885db3793d524..664049c61ed4e 100644
--- a/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolCallbackWrapper.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/Threading/ThreadPoolCallbackWrapper.cs
@@ -13,8 +13,10 @@ public static ThreadPoolCallbackWrapper Enter()
             if (!currentThread.IsThreadPoolThread)
             {
                 currentThread.IsThreadPoolThread = true;
+#if TARGET_WINDOWS
                 // when using the Windows Threadpool, this is needed to increment the ThreadCount
                 ThreadPool.InitializeForThreadPoolThread();
+#endif
             }
             return new ThreadPoolCallbackWrapper
             {