VBA - Application.Screenupdating gives invalid use of property error

[Simebaby]

Hi All
I have a macro where I'd like to disable screen updating for the entire run-time.
The macro has a main entry point, which does call other (private) subs.
If I add Application.Screenupdating false to the top of the main entry point, I get an 'Invalid use of property' compile error.
Where am I going wrong? Is this because the sub calls other subs within the process?
TIA
Si

[Simebaby]

..and I've just realised I need to use application.screenupdating = false