diff --git a/ceph-rbd-backup/script.sh b/ceph-rbd-backup/script.sh
index ccd6533..db4a8e2 100644
--- a/ceph-rbd-backup/script.sh
+++ b/ceph-rbd-backup/script.sh
@@ -12,7 +12,7 @@ OUTPUT_FILE="${OUTPUT_FILE:-}"
 rbd --name ${CEPH_USERNAME} snap create ${RBD_POOL}/${RBD_IMAGE_ID}@${SNAPSHOT_ID};
 
 # Export the snapshot to a file
-rbd --name ${CEPH_USERNAME} export --export-format 2 ${RBD_POOL}/${RBD_IMAGE_ID}@${SNAPSHOT_ID} - | zstd -T1 -3 ${OUTPUT_FILE};
+rbd --name ${CEPH_USERNAME} export --export-format 2 ${RBD_POOL}/${RBD_IMAGE_ID}@${SNAPSHOT_ID} - | zstd -T1 -3 -o ${OUTPUT_FILE};
 touch ${OUTPUT_FILE}.done;
 
 ls -al ${OUTPUT_FILE};