diff --git a/jdk/src/windows/native/sun/tools/attach/WindowsVirtualMachine.c b/jdk/src/windows/native/sun/tools/attach/WindowsVirtualMachine.c
index cd0d3f0137..07c29b2ae2 100644
--- a/jdk/src/windows/native/sun/tools/attach/WindowsVirtualMachine.c
+++ b/jdk/src/windows/native/sun/tools/attach/WindowsVirtualMachine.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2005, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -392,6 +392,7 @@ JNIEXPORT void JNICALL Java_sun_tools_attach_WindowsVirtualMachine_enqueue
     /*
      * Setup data to copy to target process
      */
+    memset(&data, 0, sizeof(data));
     data._GetModuleHandle = _GetModuleHandle;
     data._GetProcAddress = _GetProcAddress;