diff --git a/lib/Data/Database.php b/lib/Data/Database.php
index c34ee13..3ca7b75 100644
--- a/lib/Data/Database.php
+++ b/lib/Data/Database.php
@@ -584,7 +584,7 @@ class Database extends AbstractData
             // workaround for https://bugs.php.net/bug.php?id=46728
             $result = array();
             while ($row = $statement->fetch(PDO::FETCH_ASSOC)) {
-                $result[] = array_map('self::_sanitizeClob', $row);
+                $result[] = array_map('PrivateBin\Data\Database::_sanitizeClob', $row);
             }
         } else {
             $result = $statement->fetchAll(PDO::FETCH_ASSOC);
@@ -593,7 +593,7 @@ class Database extends AbstractData
         if (self::$_type === 'oci' && is_array($result)) {
             // returned CLOB values are streams, convert these into strings
             $result = $firstOnly ?
-                array_map('self::_sanitizeClob', $result) :
+                array_map('PrivateBin\Data\Database::_sanitizeClob', $result) :
                 $result;
         }
         return $result;
diff --git a/lib/Data/Filesystem.php b/lib/Data/Filesystem.php
index b2bc1ee..9674513 100644
--- a/lib/Data/Filesystem.php
+++ b/lib/Data/Filesystem.php
@@ -351,7 +351,7 @@ class Filesystem extends AbstractData
         $pastes     = array();
         $firstLevel = array_filter(
             scandir(self::$_path),
-            'self::_isFirstLevelDir'
+            'PrivateBin\Data\Filesystem::_isFirstLevelDir'
         );
         if (count($firstLevel) > 0) {
             // try at most 10 times the $batchsize pastes before giving up
@@ -359,7 +359,7 @@ class Filesystem extends AbstractData
                 $firstKey    = array_rand($firstLevel);
                 $secondLevel = array_filter(
                     scandir(self::$_path . DIRECTORY_SEPARATOR . $firstLevel[$firstKey]),
-                    'self::_isSecondLevelDir'
+                    'PrivateBin\Data\Filesystem::_isSecondLevelDir'
                 );
 
                 // skip this folder in the next checks if it is empty
diff --git a/lib/I18n.php b/lib/I18n.php
index 6394a58..c3c635f 100644
--- a/lib/I18n.php
+++ b/lib/I18n.php
@@ -84,7 +84,7 @@ class I18n
      */
     public static function _($messageId)
     {
-        return forward_static_call_array('self::translate', func_get_args());
+        return forward_static_call_array('PrivateBin\I18n::translate', func_get_args());
     }
 
     /**