PIC16F877A Comparator interrupt always triggered

void interrupt(void){
     PORTB.F0 = ~PORTB.F0;   //invert the output on portb pin 0
     PIR2.CMIF = 0;
}

void main() {
     TRISA = 0XFF;
     TRISB = 0x00;
     PORTB = 0x00;
     CMCON = 0b00000011; //Use external voltage reference connected to RA3
                         //"-" input of C1 connected to RA0
                         //Mode 011

     PIE2.CMIE = 1;
     INTCON.PEIE = 1;
     INTCON.GIE = 1;
     
     while(1){}
}

void interrupt(void){
     CMCON.C2OUT = 0;
     PORTB.F0 = ~PORTB.F0;
     PIR2.CMIF = 0;
}