StandAloneBlast Unallowed parameter

[kleenix]

I'm not sure if i'm doing this wrong. I am trying to use the -m parameter in blastall using the StandAloneBlast bioperl class.
when i add 'm'=>0 to @params i get Unallowed parameter: error.
Am I adding the parameter wrong? i'm using StandAloneBlast version 1.51

Thanks

-Nevo