diff --git a/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php b/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
index cb548ef48c..d27cd6c182 100644
--- a/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
+++ b/lib/Alchemy/Phrasea/WorkerManager/Worker/ExposeUploadWorker.php
@@ -189,7 +189,7 @@ public function process(array $payload)
 
             if (in_array($payload['databoxId'], $sendVttField)) {
                 foreach ($databox->get_meta_structure() as $meta) {
-                    if (1 === preg_match('#^VideoTextTrack([a-z]{2}(?:[-_]\w+)?)#i', $meta->get_name(), $matches)  && $caption->has_field($meta->get_name())) {
+                    if (1 === preg_match('#^VideoTextTrack([a-z]{2}(?:[-_]\w+)?)$#i', trim($meta->get_name()), $matches)  && $caption->has_field($meta->get_name())) {
                         // retrieve value for the corresponding field
                         $fieldValues = $record->get_caption()->get_field($meta->get_name())->get_values();
                         $fieldValue = array_pop($fieldValues);