diff --git a/src/ZugferdDocumentBuilder.php b/src/ZugferdDocumentBuilder.php
index 33b470e3..fd1dfe92 100644
--- a/src/ZugferdDocumentBuilder.php
+++ b/src/ZugferdDocumentBuilder.php
@@ -87,7 +87,7 @@ public function __toString()
      */
     public static function createNew(int $profileId): ZugferdDocumentBuilder
     {
-        return (new self($profileId))->initNewDocument();
+        return (new static($profileId))->initNewDocument();
     }
 
     /**
diff --git a/src/ZugferdDocumentReader.php b/src/ZugferdDocumentReader.php
index cbdb2f52..dc64890c 100644
--- a/src/ZugferdDocumentReader.php
+++ b/src/ZugferdDocumentReader.php
@@ -226,7 +226,7 @@ public static function readAndGuessFromContent(string $xmlcontent): ZugferdDocum
     {
         $profileId = ZugferdProfileResolver::resolveProfileId($xmlcontent);
 
-        return (new self($profileId))->readContent($xmlcontent);
+        return (new static($profileId))->readContent($xmlcontent);
     }
 
     /**
diff --git a/src/quick/ZugferdQuickDescriptor.php b/src/quick/ZugferdQuickDescriptor.php
index 635b5390..e30d643f 100644
--- a/src/quick/ZugferdQuickDescriptor.php
+++ b/src/quick/ZugferdQuickDescriptor.php
@@ -76,7 +76,7 @@ protected static function getProfile(): int
      */
     public static function doCreateNew(): ZugferdQuickDescriptor
     {
-        return (new self(static::getProfile()));
+        return static::createNew(static::getProfile());
     }
 
     /**