diff --git a/h5peditor-ajax.class.php b/h5peditor-ajax.class.php
index 812bab38..e8fa4627 100644
--- a/h5peditor-ajax.class.php
+++ b/h5peditor-ajax.class.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Moodle;
+
 abstract class H5PEditorEndpoints {
 
   /**
diff --git a/h5peditor-ajax.interface.php b/h5peditor-ajax.interface.php
index d45b2b1b..89d42634 100644
--- a/h5peditor-ajax.interface.php
+++ b/h5peditor-ajax.interface.php
@@ -1,5 +1,6 @@
 <?php
 
+namespace Moodle;
 
 /**
  * Handles Ajax functionality that must be implemented separately for each of the
diff --git a/h5peditor-file.class.php b/h5peditor-file.class.php
index ebda1a6e..bf3f5d7e 100644
--- a/h5peditor-file.class.php
+++ b/h5peditor-file.class.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Moodle;
+
 /**
  * Class
  */
diff --git a/h5peditor-storage.interface.php b/h5peditor-storage.interface.php
index 92939c8c..763ea5ec 100644
--- a/h5peditor-storage.interface.php
+++ b/h5peditor-storage.interface.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Moodle;
+
 /**
  * A defined interface for the editor to communicate with the database of the
  * web system.
diff --git a/h5peditor.class.php b/h5peditor.class.php
index 8b416904..b0c4a8b5 100644
--- a/h5peditor.class.php
+++ b/h5peditor.class.php
@@ -1,5 +1,7 @@
 <?php
 
+namespace Moodle;
+
 class H5peditor {
 
   private static $hasWYSIWYGEditor = array(