diff --git a/includes/sanitizers/class-amp-core-theme-sanitizer.php b/includes/sanitizers/class-amp-core-theme-sanitizer.php
index 20b1ee563cd..c31566afe0d 100644
--- a/includes/sanitizers/class-amp-core-theme-sanitizer.php
+++ b/includes/sanitizers/class-amp-core-theme-sanitizer.php
@@ -361,8 +361,7 @@ public static function add_twentyseventeen_attachment_image_attributes() {
 
 			$sizes = wp_get_attachment_image_sizes( $attachment->ID, $size );
 			if ( false !== $sizes ) {
-				$attr['layout'] = 'responsive';
-				$attr['sizes']  = $sizes;
+				$attr['sizes'] = $sizes;
 			}
 
 			return $attr;