diff --git a/src/wp-includes/feed.php b/src/wp-includes/feed.php
index d01fba7c8b..7b4046b22a 100644
--- a/src/wp-includes/feed.php
+++ b/src/wp-includes/feed.php
@@ -587,7 +587,7 @@ function prep_atom_text_construct( $data ) {
 function atom_site_icon() {
 	$url = get_site_icon_url( 32 );
 	if ( $url ) {
-		echo "<icon>$url</icon>\n";
+		echo '<icon>' . convert_chars( $url ) . "</icon>\n";
 	}
 }