diff --git a/Moosh/Command/Moodle39/Dev/GenerateFiles.php b/Moosh/Command/Moodle39/Dev/GenerateFiles.php
index fa9bb047..e634b9b9 100644
--- a/Moosh/Command/Moodle39/Dev/GenerateFiles.php
+++ b/Moosh/Command/Moodle39/Dev/GenerateFiles.php
@@ -163,7 +163,7 @@ private function create_files() {
 
             // Generate random binary data (different for each file so it
             // doesn't compress unrealistically).
-            $data = random_bytes_emulate($this->filesize);
+            $data = random_bytes($this->filesize);
 
             $fs->create_file_from_string($filerecord, $data);
             $this->dot($i, $count);