diff --git a/lib/Configuration.php b/lib/Configuration.php
index 571ef56..274743e 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -12,9 +12,9 @@
 
 namespace PrivateBin;
 
-use PrivateBin\Persistence\DataStore;
 use Exception;
 use PDO;
+use PrivateBin\Persistence\DataStore;
 
 /**
  * Configuration
diff --git a/lib/Persistence/DataStore.php b/lib/Persistence/DataStore.php
index d14453a..7ab4af5 100644
--- a/lib/Persistence/DataStore.php
+++ b/lib/Persistence/DataStore.php
@@ -80,7 +80,7 @@ class DataStore extends AbstractPersistence
         // don't overwrite already converted file
         if (!is_readable($destFile)) {
             $handle = fopen($srcFile, 'r', false, stream_context_create());
-            file_put_contents($destFile, $prefix . DataStore::PROTECTION_LINE . PHP_EOL);
+            file_put_contents($destFile, $prefix . self::PROTECTION_LINE . PHP_EOL);
             file_put_contents($destFile, $handle, FILE_APPEND);
             fclose($handle);
         }