diff --git a/htdocs/core/lib/files.lib.php b/htdocs/core/lib/files.lib.php
index aefc89bcc04..d6e30e93b34 100644
--- a/htdocs/core/lib/files.lib.php
+++ b/htdocs/core/lib/files.lib.php
@@ -2434,10 +2434,11 @@ function dol_check_secure_access_document($modulepart, $original_file, $entity,
 	// Find the subdirectory name as the reference. For example original_file='10/myfile.pdf' -> refname='10'
 	if (empty($refname)) {
 		$refname = basename(dirname($original_file)."/");
-		if ($refname == 'thumbs') {
-			// If we get the thumbns directory, we must go one step higher. For example original_file='10/thumbs/myfile_small.jpg' -> refname='10'
-			$refname = basename(dirname(dirname($original_file))."/");
-		}
+	}
+
+	if ($refname == 'thumbs') {
+		// If we get the thumbns directory, we must go one step higher. For example original_file='10/thumbs/myfile_small.jpg' -> refname='10'
+		$refname = basename(dirname(dirname($original_file))."/");
 	}
 
 	// Define possible keys to use for permission check