diff --git a/source/components/parser/pswalk.c b/source/components/parser/pswalk.c
index 82fc0615e..fe279c421 100644
--- a/source/components/parser/pswalk.c
+++ b/source/components/parser/pswalk.c
@@ -1,7 +1,7 @@
 /******************************************************************************
  *
  * Module Name: pswalk - Parser routines to walk parsed op tree(s)
- *              $Revision: 1.51 $
+ *              $Revision: 1.53 $
  *
  *****************************************************************************/
 
@@ -9,7 +9,7 @@
  *
  * 1. Copyright Notice
  *
- * Some or all of this work - Copyright (c) 1999, 2000, Intel Corp.
+ * Some or all of this work - Copyright (c) 1999, 2000, 2001, Intel Corp.
  * All rights reserved.
  *
  * 2. License
@@ -349,6 +349,9 @@ AcpiPsDeleteParseTree (
     /* Create and initialize a new walk list */
 
     WalkList.WalkState = NULL;
+    WalkList.AcquiredMutexList.Prev = NULL;
+    WalkList.AcquiredMutexList.Next = NULL;
+
     WalkState = AcpiDsCreateWalkState (TABLE_ID_DSDT, NULL, NULL, &WalkList);
     if (!WalkState)
     {
@@ -379,6 +382,7 @@ AcpiPsDeleteParseTree (
 
     /* We are done with this walk */
 
+    AcpiAmlReleaseAllMutexes ((ACPI_OPERAND_OBJECT *) &WalkList.AcquiredMutexList);
     AcpiDsDeleteWalkState (WalkState);
 
     return_VOID;