diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index a1a6e6c705..e535ef84f0 100644
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -691,7 +691,7 @@ class WP_Object_Cache {
 		echo "</p>";
 		echo '<ul>';
 		foreach ($this->cache as $group => $cache) {
-			echo "<li><strong>Group:</strong> $group - ( " . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
+			echo '<li><strong>Group:</strong> ' . esc_html( $group ) . ' - ( ' . number_format( strlen( serialize( $cache ) ) / KB_IN_BYTES, 2 ) . 'k )</li>';
 		}
 		echo '</ul>';
 	}