diff --git a/app/code/Magento/PageCache/Observer/ProcessLayoutRenderElement.php b/app/code/Magento/PageCache/Observer/ProcessLayoutRenderElement.php
index aa96c1060207e..c3146918b8009 100644
--- a/app/code/Magento/PageCache/Observer/ProcessLayoutRenderElement.php
+++ b/app/code/Magento/PageCache/Observer/ProcessLayoutRenderElement.php
@@ -114,7 +114,7 @@ public function execute(\Magento\Framework\Event\Observer $observer)
                     $output = $this->_wrapEsi($block, $layout);
                 } elseif ($block->isScopePrivate()) {
                     $output = sprintf(
-                        '<!-- BLOCK %1$s -->%2$s<!-- /BLOCK %1$s -->',
+                        '<!-- BLOCK %1$s --><!-- /BLOCK %1$s -->',
                         $block->getNameInLayout(),
                         $output
                     );