diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index a385b6dd2d..aaab7971f6 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -16,6 +16,18 @@
    The license applies to all entries newer than 2009-04-28.
 */
 
+2010-06-20 15:24 UTC+0200 Viktor Szakats (harbour.01 syenar.hu)
+  * src/vm/thread.c
+    * Added casts to pacify msvc64 warnings.
+      Of some the ones related to pMutex->events I'm unsure of,
+      probably it's better to use 'int' instead of HB_ULONG for
+      internal variable in some cases to make it look cleaner,
+      though I assume there was a reason for it, so I left it.
+      Please check me.
+
+  * src/vm/classes.c
+    * Added casts to pacify msvc64 warnings.
+
 2010-06-20 15:10 UTC+0200 Viktor Szakats (harbour.01 syenar.hu)
   * src/vm/extend.c
     ! Fixed typo in hb_retns().
diff --git a/harbour/src/vm/classes.c b/harbour/src/vm/classes.c
index 5d7d777a1f..e4af27d1e6 100644
--- a/harbour/src/vm/classes.c
+++ b/harbour/src/vm/classes.c
@@ -3903,7 +3903,7 @@ HB_FUNC( __CLS_CNTCLSDATA )
    HB_USHORT uiClass = ( HB_USHORT ) hb_parni( 1 );
 
    hb_retni( uiClass && uiClass <= s_uiClasses ?
-                  hb_arrayLen( s_pClasses[ uiClass ]->pClassDatas ) : 0 );
+                  ( HB_USHORT ) hb_arrayLen( s_pClasses[ uiClass ]->pClassDatas ) : 0 );
 }
 
 /*
@@ -3917,7 +3917,7 @@ HB_FUNC( __CLS_CNTSHRDATA )
    HB_USHORT uiClass = ( HB_USHORT ) hb_parni( 1 );
 
    hb_retni( uiClass && uiClass <= s_uiClasses ?
-                  hb_arrayLen( s_pClasses[ uiClass ]->pSharedDatas ) : 0 );
+                  ( HB_USHORT ) hb_arrayLen( s_pClasses[ uiClass ]->pSharedDatas ) : 0 );
 }
 
 /*
@@ -4236,7 +4236,7 @@ HB_FUNC_STATIC( msgClassSel )
       HB_USHORT nParam, nScope;
       HB_BOOL lFull;
 
-      nParam = hb_parnidef( 1, HB_MSGLISTALL );
+      nParam = ( HB_USHORT ) hb_parnidef( 1, HB_MSGLISTALL );
       nScope = ( HB_USHORT ) hb_parni( 2 );
       lFull = hb_parl( 3 );
       pReturn = hb_itemArrayNew( pClass->uiMethods );
diff --git a/harbour/src/vm/thread.c b/harbour/src/vm/thread.c
index 5c0288c003..b02a4e47c7 100644
--- a/harbour/src/vm/thread.c
+++ b/harbour/src/vm/thread.c
@@ -957,7 +957,7 @@ static HB_THREAD_STARTFUNC( hb_threadStartVM )
 
    hb_vmThreadInit( ( void * ) pThread );
 
-   ulPCount = hb_arrayLen( pThread->pParams );
+   ulPCount = ( HB_ULONG ) hb_arrayLen( pThread->pParams );
    if( ulPCount > 0 )
    {
       PHB_ITEM pStart = hb_arrayGetItemPtr( pThread->pParams, 1 );
@@ -1123,7 +1123,7 @@ HB_FUNC( HB_THREADSTART )
       pThread->pSet      = hb_setClone( hb_stackSetStruct() );
       pThread->pParams   = hb_arrayBaseParams();
 
-      ulPCount = hb_arrayLen( pThread->pParams );
+      ulPCount = ( HB_ULONG ) hb_arrayLen( pThread->pParams );
       /* remove thread attributes */
       if( ulStart > 1 )
       {
@@ -1744,7 +1744,7 @@ void hb_threadMutexSyncSignal( PHB_ITEM pItemMtx )
          }
          else
          {
-            HB_ULONG ulLen = hb_arrayLen( pMutex->events );
+            HB_ULONG ulLen = ( HB_ULONG ) hb_arrayLen( pMutex->events );
             iCount -= ulLen;
             if( iCount > 0 )
                hb_arraySize( pMutex->events, ulLen + iCount );
@@ -2088,7 +2088,7 @@ void hb_threadMutexNotify( PHB_ITEM pItem, PHB_ITEM pNotifier, HB_BOOL fWaiting
 
          if( pMutex->events )
          {
-            ulLen = hb_arrayLen( pMutex->events );
+            ulLen = ( HB_ULONG ) hb_arrayLen( pMutex->events );
             iCount -= ulLen;
             if( iCount > 0 )
                hb_arraySize( pMutex->events, ulLen + iCount );
@@ -2135,7 +2135,7 @@ void hb_threadMutexNotify( PHB_ITEM pItem, PHB_ITEM pNotifier, HB_BOOL fWaiting
 
          if( pMutex->events )
          {
-            ulLen = hb_arrayLen( pMutex->events );
+            ulLen = ( HB_ULONG ) hb_arrayLen( pMutex->events );
             iCount -= ulLen;
             if( iCount > 0 )
                hb_arraySize( pMutex->events, ulLen + iCount );
@@ -2509,7 +2509,7 @@ HB_FUNC( HB_MUTEXQUEUEINFO )
       if( pMutex )
       {
          hb_storni( pMutex->waiters, 2 );
-         hb_stornl( pMutex->events ? hb_arrayLen( pMutex->events ) : 0, 3 );
+         hb_stornl( pMutex->events ? ( long ) hb_arrayLen( pMutex->events ) : 0, 3 );
          hb_retl( HB_TRUE );
          return;
       }