typeset -A is giving error in script

I was using associative arrays in my script, hence I used to declare them by the typeset -A command, and it worked fine in the bash prompt But when I use it in my script, I get the following error ` typeset: -A: invalid option typeset: usage: typeset [-afFirtx] [-p] name[=value] ...` An alternative solution will also be acceptable for me. SIDENOTE: I tried typeset -a but it declares an indexed array. But I want an associative array.