diff --git a/Classes/Ttree/ContentRepositoryImporter/DataType/Integer.php b/Classes/Ttree/ContentRepositoryImporter/DataType/Integer.php
index 2c45f1e..4807a8b 100644
--- a/Classes/Ttree/ContentRepositoryImporter/DataType/Integer.php
+++ b/Classes/Ttree/ContentRepositoryImporter/DataType/Integer.php
@@ -10,7 +10,7 @@
 /**
  * String Data Type
  */
-class Integer extends String
+class Integer extends StringValue
 {
     /**
      * @return integer
diff --git a/Classes/Ttree/ContentRepositoryImporter/DataType/Slug.php b/Classes/Ttree/ContentRepositoryImporter/DataType/Slug.php
index 1020b29..dcc792d 100644
--- a/Classes/Ttree/ContentRepositoryImporter/DataType/Slug.php
+++ b/Classes/Ttree/ContentRepositoryImporter/DataType/Slug.php
@@ -20,7 +20,7 @@ class Slug extends DataType
      */
     protected function initializeValue($value)
     {
-        $value = new String($value);
+        $value = new StringValue($value);
         $slugify = new Slugify();
         $this->value = $slugify->slugify($value->getValue());
     }
diff --git a/Classes/Ttree/ContentRepositoryImporter/DataType/String.php b/Classes/Ttree/ContentRepositoryImporter/DataType/StringValue.php
similarity index 94%
rename from Classes/Ttree/ContentRepositoryImporter/DataType/String.php
rename to Classes/Ttree/ContentRepositoryImporter/DataType/StringValue.php
index ca31d69..08d0a6c 100644
--- a/Classes/Ttree/ContentRepositoryImporter/DataType/String.php
+++ b/Classes/Ttree/ContentRepositoryImporter/DataType/StringValue.php
@@ -10,7 +10,7 @@
 /**
  * String Data Type
  */
-class String extends DataType
+class StringValue extends DataType
 {
     /**
      * @param string $value