If it's a split receptacle, then you have a couple options.
- Installing a double pole GFCI breaker to protect the entire circuit.
- Using multiple GFCI receptacles in locations upstream from this device (if applicable).
Double pole GFCI breaker
#Double pole GFCI breaker ThisThis ones fairly easy. Run out to the store, purchase a properly sized double pole GFCI breaker, and replace the old breaker with it.
GFCI receptacles
#GFCI receptacles IfIf there are outlets upstream from this device, you could install a GFCI receptacle on each part of the circuit. However, the wiring is a bit complicated, and would require you to pull an additional grounded (neutral) conductor throughout the circuit.