starne error from select 1!=-1

["Andrus" <eetasoft@xxxxxxxxx>]

select 1!=-1

causes

ERROR:  operator does not exist: integer !=- integer
HINT:  No operator matches the given name and argument type(s). You may need 
to add explicit type casts.


Isn't this a bit stange ?
If I add space before -1 error does not appear.