diff --git a/backup-tar/backup.sh b/backup-tar/backup.sh
index 42e1773ab3589cde5c3c9de799386ef75d38cd4d..44ce584be3fc89a79e93705685bda0056d38d84f 100755
--- a/backup-tar/backup.sh
+++ b/backup-tar/backup.sh
@@ -13,8 +13,9 @@ fail() {
     exit 1
 }
 
-TARGET=backup-$HOSTNAME@antea
-SOURCES_FILE=$SCRIPT_DIR/sources_$HOSTNAME
+SHORT_HOST=$(hostname -s)
+TARGET=backup-$SHORT_HOST@antea
+SOURCES_FILE=$SCRIPT_DIR/sources_$SHORT_HOST
 . $SOURCES_FILE
 [[ $SOURCES ]] || fail "SOURCES expected to be set in $SOURCES_FILE"
 TIMESTAMP=$(date +"%Y-%m-%d")