diff --git a/pyslurm/core/reservation.pyx b/pyslurm/core/reservation.pyx
index fa3099ad..a55b0439 100644
--- a/pyslurm/core/reservation.pyx
+++ b/pyslurm/core/reservation.pyx
@@ -534,6 +534,7 @@ class ReservationFlags(SlurmFlag):
     ALL_NODES             = slurm.RESERVE_FLAG_ALL_NODES
     SKIP                  = slurm.RESERVE_FLAG_SKIP
     SCHED_FAILED          = slurm.RESERVE_FLAG_SCHED_FAILED
+    REPLACE_DOWN          = slurm.RESERVE_FLAG_REPLACE_DOWN
 
 
 class ReservationReoccurrence(SlurmEnum):