diff --git a/src/wp-includes/class-wp-block.php b/src/wp-includes/class-wp-block.php
index 80757baabc..9f58a5fe45 100644
--- a/src/wp-includes/class-wp-block.php
+++ b/src/wp-includes/class-wp-block.php
@@ -376,7 +376,7 @@ class WP_Block {
 				) ) {
 					return $block_content;
 				}
-				$amended_content->set_attribute( $block_type->attributes[ $attribute_name ]['attribute'], esc_attr( $source_value ) );
+				$amended_content->set_attribute( $block_type->attributes[ $attribute_name ]['attribute'], $source_value );
 				return $amended_content->get_updated_html();
 				break;