diff --git a/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs b/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
index c1978eab5f111..2c7c0400c63fc 100644
--- a/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
+++ b/src/mono/System.Private.CoreLib/src/System/Threading/Thread.Mono.cs
@@ -82,7 +82,7 @@ private Thread()
         ~Thread()
         {
 #if TARGET_UNIX || TARGET_BROWSER
-            WaitSubsystem.OnThreadExiting(this);
+            _waitInfo?.OnThreadExiting();
 #endif
             FreeInternal();
         }