diff --git a/src/Object/AbstractObject.php b/src/Object/AbstractObject.php
index 19bff48..bd69691 100644
--- a/src/Object/AbstractObject.php
+++ b/src/Object/AbstractObject.php
@@ -718,7 +718,7 @@ public function setFont($value)
     {
         if (is_int($value) && $value >= 1 && $value <= 5) {
             if (!extension_loaded('gd')) {
-                throw new ExtensionNotLoaded(
+                throw new ExtensionNotLoadedException(
                     'GD extension is required to use numeric font'
                 );
             }
diff --git a/src/Object/Exception/ExtensionNotLoadedException.php b/src/Object/Exception/ExtensionNotLoadedException.php
new file mode 100644
index 0000000..63e69d0
--- /dev/null
+++ b/src/Object/Exception/ExtensionNotLoadedException.php
@@ -0,0 +1,9 @@
+<?php
+
+namespace Zend\Barcode\Object\Exception;
+
+class ExtensionNotLoadedException
+    extends \RuntimeException
+    implements \Zend\Barcode\Object\Exception
+{
+}
\ No newline at end of file