Just add it & save it.
Code:
;----- INTCON Bits --------------------------------------------------------

GIE                          EQU     H'0007'
PEIE                         EQU     H'0006'
T0IE                         EQU     H'0005' ; <---- same as below without the MR
TMR0IE                       EQU     H'0005'
INTE                         EQU     H'0004'
RBIE                         EQU     H'0003'
T0IF                         EQU     H'0002'
TMR0IF                       EQU     H'0002'
INTF                         EQU     H'0001'
RBIF                         EQU     H'0000'