diff --git a/src/entrypoint.sh b/src/entrypoint.sh
index 86e77cf..6d2f271 100644
--- a/src/entrypoint.sh
+++ b/src/entrypoint.sh
@@ -17,6 +17,7 @@ BACKUP_ARCHIVE="${BACKUP_ARCHIVE:-/archive}"
 
 BACKUP_RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-}"
 BACKUP_PRUNING_LEEWAY="${BACKUP_PRUNING_LEEWAY:-10m}"
+BACKUP_PRUNING_PREFIX="${BACKUP_PRUNING_PREFIX:-}"
 BACKUP_STOP_CONTAINER_LABEL="${BACKUP_STOP_CONTAINER_LABEL:-true}"
 
 AWS_S3_BUCKET_NAME="${AWS_S3_BUCKET_NAME:-}"