diff --git a/include/html2plain.php b/include/html2plain.php
index 2f5be7f69..979354079 100644
--- a/include/html2plain.php
+++ b/include/html2plain.php
@@ -113,7 +113,7 @@ function html2plain($html, $wraplength = 75, $compact = false)
 	$xpath = new DomXPath($doc);
 	$list = $xpath->query("//pre");
 	foreach ($list as $node) {
-		$node->nodeValue = str_replace("\n", "\r", $node->nodeValue);
+		$node->nodeValue = str_replace("\n", "\r", htmlspecialchars($node->nodeValue));
 	}
 
 	$message = $doc->saveHTML();