diff --git a/src/backups.js b/src/backups.js
index dd5b95621..385d30b42 100644
--- a/src/backups.js
+++ b/src/backups.js
@@ -255,7 +255,8 @@ function backupBoxWithAppBackupIds(appBackupIds, callback) {
 
         debug('backupBoxWithAppBackupIds:  %j', result);
 
-        var args = [ result.s3Url, result.accessKeyId, result.secretAccessKey, result.sessionToken, result.region, result.backupKey ];
+        var args = [ result.s3Url, result.accessKeyId, result.secretAccessKey, result.region, result.backupKey ];
+        if (result.sessionToken) args.push(result.sessionToken);
 
         shell.sudo('backupBox', [ BACKUP_BOX_CMD ].concat(args), function (error) {
             if (error) return callback(new BackupsError(BackupsError.INTERNAL_ERROR, error));
@@ -321,8 +322,8 @@ function createNewAppBackup(app, manifest, callback) {
 
         debugApp(app, 'createNewAppBackup: backup url:%s backup config url:%s', result.s3DataUrl, result.s3ConfigUrl);
 
-        var args = [ app.id, result.s3ConfigUrl, result.s3DataUrl, result.accessKeyId, result.secretAccessKey,
-                     result.sessionToken, result.region, result.backupKey ];
+        var args = [ app.id, result.s3ConfigUrl, result.s3DataUrl, result.accessKeyId, result.secretAccessKey, result.region, result.backupKey ];
+        if (result.sessionToken) args.push(result.sessionToken);
 
         async.series([
             addons.backupAddons.bind(null, app, manifest.addons),
diff --git a/src/scripts/backupapp.sh b/src/scripts/backupapp.sh
index f0a1fadbf..9ef934140 100755
--- a/src/scripts/backupapp.sh
+++ b/src/scripts/backupapp.sh
@@ -12,8 +12,8 @@ if [[ $# == 1 && "$1" == "--check" ]]; then
     exit 0
 fi
 
-if [ $# -lt 8 ]; then
-    echo "Usage: backupapp.sh <appid> <s3 config url> <s3 data url> <access key id> <access key> <session token> <region> <password>"
+if [ $# -lt 7 ]; then
+    echo "Usage: backupapp.sh <appid> <s3 config url> <s3 data url> <access key id> <access key> <region> <password> [session token]"
     exit 1
 fi
 
@@ -25,9 +25,12 @@ readonly s3_config_url="$2"
 readonly s3_data_url="$3"
 export AWS_ACCESS_KEY_ID="$4"
 export AWS_SECRET_ACCESS_KEY="$5"
-export AWS_SESSION_TOKEN="$6"
-export AWS_DEFAULT_REGION="$7"
-readonly password="$8"
+export AWS_DEFAULT_REGION="$6"
+readonly password="$7"
+
+if [ $# -gt 7 ]; then
+    export AWS_SESSION_TOKEN="$8"
+fi
 
 readonly now=$(date "+%Y-%m-%dT%H:%M:%S")
 readonly app_data_dir="${DATA_DIR}/${app_id}"
diff --git a/src/scripts/backupbox.sh b/src/scripts/backupbox.sh
index 40c94a122..981fc647c 100755
--- a/src/scripts/backupbox.sh
+++ b/src/scripts/backupbox.sh
@@ -12,8 +12,8 @@ if [[ $# == 1 && "$1" == "--check" ]]; then
     exit 0
 fi
 
-if [ $# -lt 6 ]; then
-    echo "Usage: backupbox.sh <s3 url> <access key id> <access key> <session token> <region> <password>"
+if [ $# -lt 5 ]; then
+    echo "Usage: backupbox.sh <s3 url> <access key id> <access key> <region> <password> [session token]"
     exit 1
 fi
 
@@ -21,9 +21,13 @@ fi
 s3_url="$1"
 export AWS_ACCESS_KEY_ID="$2"
 export AWS_SECRET_ACCESS_KEY="$3"
-export AWS_SESSION_TOKEN="$4"
-export AWS_DEFAULT_REGION="$5"
-password="$6"
+export AWS_DEFAULT_REGION="$4"
+password="$5"
+
+if [ $# -gt 5 ]; then
+    export AWS_SESSION_TOKEN="$6"
+fi
+
 now=$(date "+%Y-%m-%dT%H:%M:%S")
 BOX_DATA_DIR="${HOME}/data/box"
 box_snapshot_dir="${HOME}/data/snapshots/box-${now}"