diff --git a/src/ImportField.php b/src/ImportField.php
index 8065bcc..e2baf09 100644
--- a/src/ImportField.php
+++ b/src/ImportField.php
@@ -387,19 +387,19 @@ public function importFromPOST($tmpFile, $splitHeader = false, $publishPages = f
         $els = $doc->getElementsByTagName('*');
 
         $headingXPath = [
-            'self::h1',
-            'self::h2',
-            'self::h3',
-            'self::h4',
-            'self::h5',
-            'self::h6',
+            'ImportField::h1',
+            'ImportField::h2',
+            'ImportField::h3',
+            'ImportField::h4',
+            'ImportField::h5',
+            'ImportField::h6',
         ];
         // Remove a bunch of unwanted elements
         $clean = [
             // Empty paragraphs
-            '//p[not(descendant-or-self::text() | descendant-or-self::img)]',
+            '//p[not(descendant-or-ImportField::text() | descendant-or-ImportField::img)]',
             // Empty headers
-            '//*[' . implode(' | ', $headingXPath) . '][not(descendant-or-self::text() | descendant-or-self::img)]',
+            '//*[' . implode(' | ', $headingXPath) . '][not(descendant-or-ImportField::text() | descendant-or-ImportField::img)]',
             // Anchors
             '//a[not(@href)]',
             // BR tags
diff --git a/src/SettingsField.php b/src/SettingsField.php
index e8a057e..2573491 100644
--- a/src/SettingsField.php
+++ b/src/SettingsField.php
@@ -33,7 +33,7 @@ class SettingsField extends CompositeField
     public function __construct($children = null)
     {
         if ($children) {
-            $class = self::class;
+            $class = SettingsField::class;
             throw new InvalidArgumentException(
                 "{$class}::__construct does not accept extra parameters."
             );