diff --git a/spec/Converter/ImageConverterSpec.php b/spec/Converter/ImageConverterSpec.php
index c068a26..676cfae 100644
--- a/spec/Converter/ImageConverterSpec.php
+++ b/spec/Converter/ImageConverterSpec.php
@@ -28,6 +28,7 @@ public function it_converts_an_image_to_amp_img(
         $ampImg->setAttribute('srcset', '')->shouldNotBeCalled();
         $ampImg->setAttribute('alt', '')->shouldNotBeCalled();
         $ampImg->setAttribute('attribution', '')->shouldNotBeCalled();
+        $ampImg->setAttribute('layout', '')->shouldNotBeCalled();
 
         $element->getAttribute('src')->shouldBeCalled()->willReturn('foo.jpg');
         $element->getAttribute('width')->shouldBeCalled()->willReturn(300);
@@ -36,6 +37,7 @@ public function it_converts_an_image_to_amp_img(
         $element->getAttribute('srcset')->shouldBeCalled()->willReturn('');
         $element->getAttribute('alt')->shouldBeCalled()->willReturn('');
         $element->getAttribute('attribution')->shouldBeCalled()->willReturn('');
+        $element->getAttribute('layout')->shouldBeCalled()->willReturn('');
 
         $element
             ->createWritableElement('amp-img')
diff --git a/src/Converter/ImageConverter.php b/src/Converter/ImageConverter.php
index 3d9fa9f..8cdc665 100644
--- a/src/Converter/ImageConverter.php
+++ b/src/Converter/ImageConverter.php
@@ -8,7 +8,7 @@
 class ImageConverter implements ConverterInterface
 {
     private $validAttributes = [
-        'src', 'width', 'height', 'srcset', 'alt', 'attribution', 'class'
+        'src', 'width', 'height', 'srcset', 'alt', 'attribution', 'class', 'layout'
     ];
 
     public function handleTagImg(EventInterface $event, ElementInterface $element)