diff --git a/Dockerfile b/Dockerfile
index 7a622a2..850a472 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,4 +29,4 @@ COPY entrypoint.sh /var/entrypoint.sh
 RUN chmod +x /var/entrypoint.sh
 ENTRYPOINT [ "/var/entrypoint.sh" ]
 
-CMD ["cron" "-f"]
+CMD ["cron", "-f"]
diff --git a/README.md b/README.md
index d0ae747..eb9be8b 100644
--- a/README.md
+++ b/README.md
@@ -3,6 +3,7 @@ Borg backup cron
 
 A docker image to backup periodically a folder using borg.
 Additionnally this image can dump a mysql database in the same folder beforehand.
+You can also run the cron job directly by overriding the command with `/var/backup_script.sh`
 
 Build
 -----
diff --git a/entrypoint.sh b/entrypoint.sh
index 5404c5d..c63310a 100644
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
-bash set -eo pipefail
+set -eo pipefail
+shopt -s nullglob
 
 # Add known hosts
 if [[ -n "$SSH_KNOWN_HOSTS" ]]; then