syntax troubles using "deferrable initially deferred"

create table templates
(
template text,
constraint template_not_null_check (template is nit null) deferrable initially deferred);

ERROR syntax error at or near "DEFERRABLE"
LINE 4: ...nt template_not_null_check (template is not null) DEFERRABLE...

Without the "deferrable initially deferred" it creates OK.

v8.3.4. on linux

Thanks in Advance.