diff --git a/app/backup/build/backup-matrix/do_backup.sh b/app/backup/build/backup-matrix/do_backup.sh
index 9f37fea..9b84762 100755
--- a/app/backup/build/backup-matrix/do_backup.sh
+++ b/app/backup/build/backup-matrix/do_backup.sh
@@ -22,6 +22,6 @@ pg_dump -v -Fc -U $MATRIX_PSQL_USER -h psql-proxy.service.2.cluster.deuxfleurs.f
 
 MATRIX_MEDIA="/mnt/glusterfs/chat/matrix/synapse/media"
 echo "export local_content"
-tar -vcf - ${MATRIX_MEDIA} | \
+tar -vzcf - ${MATRIX_MEDIA} | \
 	age -r "$(cat /root/.ssh/id_ed25519.pub)" | \
 	ssh backuphost "cat > $TARGET_SSH_DIR/matrix/media-$(date --iso-8601=minute).gz.age"