diff --git a/src/mail_deletion.sh b/src/mail_deletion.sh
index b50b836e..f9caa5bd 100755
--- a/src/mail_deletion.sh
+++ b/src/mail_deletion.sh
@@ -63,7 +63,7 @@ done
 
 # List the adresses to DELETE
 # Delete if only if there isn't any mailbox refering to it
-mysql_query "DELETE FROM a using address a, mailbox m  WHERE a.mail_action='DELETE' OR a.mail_action='DELETING' AND a.id != m.address_id;"
+mysql_query "DELETE FROM a USING address a, mailbox m  WHERE (a.mail_action='DELETE' OR a.mail_action='DELETING') AND a.id != m.address_id;"
 
 # Delete the lock
 rm -f "$LOCK_FILE"