diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index 64356c069..e86963e6e 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -1751,9 +1751,11 @@ function user_can_richedit() {
 	if ( !isset($wp_rich_edit) ) {
 		$wp_rich_edit = false;
 
-		if ( get_user_option( 'rich_editing' ) == 'true' || !is_user_logged_in() ) { // default to 'true' for logged out users
+		if ( get_user_option( 'rich_editing' ) == 'true' || ! is_user_logged_in() ) { // default to 'true' for logged out users
 			if ( $is_safari ) {
-				if ( !$is_iphone || ( preg_match( '!AppleWebKit/(\d+)!', $_SERVER['HTTP_USER_AGENT'], $match ) && intval($match[1]) >= 534 ) )
+				if ( $is_iphone || false !== strpos( $_SERVER['HTTP_USER_AGENT'], '; Silk/' ) )
+					$wp_rich_edit = ( preg_match( '!AppleWebKit/(\d+)!', $_SERVER['HTTP_USER_AGENT'], $match ) && intval( $match[1] ) >= 534 );
+				else
 					$wp_rich_edit = true;
 			} elseif ( $is_gecko || $is_opera || $is_chrome || $is_IE ) {
 				$wp_rich_edit = true;