diff --git a/mysys/my_init.c b/mysys/my_init.c
index f47286159f7..9dd2540ac6c 100644
--- a/mysys/my_init.c
+++ b/mysys/my_init.c
@@ -218,6 +218,10 @@ static void my_win_init(void)
 
   setlocale(LC_CTYPE, "");             /* To get right sortorder */
 
+  /* Clear the OS system variable TZ and avoid the 100% CPU usage */
+  _putenv( "TZ=" ); 
+  _tzset();
+
   /* apre la chiave HKEY_LOCAL_MACHINES\software\MySQL */
   if (RegOpenKeyEx(HKEY_LOCAL_MACHINE,(LPCTSTR)targetKey,0,
 		   KEY_READ,&hSoftMysql) != ERROR_SUCCESS)