Undefined function round in expression in vb6 and ms-access 2003

Hi folks,
I am facing a silly problem with vb6.0 and ms-access as back end.
In my query i have used a round function which is giving me error in vb6.0 but that query is running successfully in ms-access I dont know what is the problem. I am getting following error -2147217900(80040e14):Undefined function round in expression.
Please help me out its urgent....