diff --git a/CHANGELOG.md b/CHANGELOG.md
index e16e726..b6384b9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+- Add an OptimusException
 
 ## [0.1.1] - 2018-03-05
 ### Fixed
diff --git a/src/AbstractMappingTransformer.php b/src/AbstractMappingTransformer.php
index 5ec6c49..669335e 100644
--- a/src/AbstractMappingTransformer.php
+++ b/src/AbstractMappingTransformer.php
@@ -2,6 +2,7 @@
 
 namespace Biig\Optimus;
 
+use Biig\Optimus\Exception\OptimusException;
 use Symfony\Component\PropertyAccess\PropertyAccess;
 use Symfony\Component\PropertyAccess\PropertyAccessor;
 
@@ -34,7 +35,7 @@ abstract public function transform(array $data);
      * @param array $mapping The mapping to use to transform input array
      * @param array $data The input array
      * @return array The output array
-     * @throws \Exception
+     * @throws OptimusException
      */
     protected function transformFromMapping(array $mapping, array $data)
     {
@@ -46,9 +47,9 @@ protected function transformFromMapping(array $mapping, array $data)
                 // Get our node value
                 $nodeValue = $this->getNodeValue($node, $data);
 
-                // If we didn't get value but field was required, throw Exception
+                // If we didn't get value but field was required, throw OptimusException
                 if (isset($node['required']) && true === $node['required'] && null === $nodeValue) {
-                    throw new \Exception('Field ' . $node['from'] . ' required.');
+                    throw new OptimusException('Field ' . $node['from'] . ' required.');
                 }
 
                 if (isset($node['dependencies'])) {
@@ -61,7 +62,7 @@ protected function transformFromMapping(array $mapping, array $data)
                     }
 
                     if ($dependenciesExist && null === $nodeValue) {
-                        throw new \Exception('Field ' . $node['from'] . ' required if dependencies true.');
+                        throw new OptimusException('Field ' . $node['from'] . ' required if dependencies true.');
                     }
                 }
 
diff --git a/src/Exception/OptimusException.php b/src/Exception/OptimusException.php
new file mode 100644
index 0000000..8d5bcc0
--- /dev/null
+++ b/src/Exception/OptimusException.php
@@ -0,0 +1,7 @@
+<?php
+
+namespace Biig\Optimus\Exception;
+
+class OptimusException extends \Exception
+{
+}
diff --git a/tests/AbstractMappingTransformerTest.php b/tests/AbstractMappingTransformerTest.php
index 31009bc..291c0ed 100644
--- a/tests/AbstractMappingTransformerTest.php
+++ b/tests/AbstractMappingTransformerTest.php
@@ -2,6 +2,7 @@
 
 namespace Biig\Optimus\Tests;
 
+use Biig\Optimus\Exception\OptimusException;
 use PHPUnit\Framework\TestCase;
 use Biig\Optimus\AbstractMappingTransformer;
 
@@ -118,6 +119,24 @@ public function testTransformFromToDefaultFunction()
 
         $this->assertEquals($expected, $result);
     }
+
+    /**
+     * @expectedException  \Biig\Optimus\Exception\OptimusException
+     * @expectedExceptionMessage Field foo required.
+     */
+    public function testItThrowAnException()
+    {
+        $mapping = [
+            'node' => [
+                'from' => 'foo',
+                'to' => 'bar',
+                'required' => true,
+            ],
+        ];
+
+        $transformer = new ProxyDummyTransformer();
+        $transformer->transformFromMapping($mapping, []);
+    }
 }
 
 class ProxyDummyTransformer extends AbstractMappingTransformer