Fix to test 876 for R CMD check.
Fix to test 876 for R CMD check.

Rdatatable/data.table,vlulla/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,jangorecki/data.table,vlulla/data.table,vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,Rdatatable/data.table,jangorecki/data.table