diff --git a/functions.php b/functions.php
index 649f47823..d516090f6 100644
--- a/functions.php
+++ b/functions.php
@@ -102,6 +102,12 @@ function twentytwelve_scripts_styles() {
 
 	/*
 	 * Loads our special font CSS file.
+	 *
+ 	 * To disable in a child theme, use wp_dequeue_style()
+ 	 * function mytheme_dequeue_fonts() {
+ 	 *     wp_dequeue_style( 'twentytwelve-fonts' );
+ 	 * }
+	 * add_action( 'wp_enqueue_scripts', 'mytheme_dequeue_fonts', 11 );
  	 */
 	$protocol = is_ssl() ? 'https' : 'http';
 	wp_enqueue_style( 'twentytwelve-fonts', "$protocol://fonts.googleapis.com/css?family=Open+Sans:400italic,700italic,400,700", array(), null );
@@ -376,6 +382,10 @@ function twentytwelve_body_class( $classes ) {
 	elseif ( in_array( $background_color, array( 'fff', 'ffffff' ) ) )
 		$classes[] = 'custom-background-white';
 
+	// Enable custom font class only if the font CSS is queued to load.
+	if ( wp_style_is( 'twentytwelve-fonts', 'queue' ) )
+		$classes[] = 'custom-font-enabled';
+
 	return $classes;
 }
 add_filter( 'body_class', 'twentytwelve_body_class' );
diff --git a/style.css b/style.css
index 8130e5e42..ecaf52075 100644
--- a/style.css
+++ b/style.css
@@ -437,10 +437,13 @@ html {
 body {
 	font-size: 14px;
 	font-size: 1rem;
-	font-family: "Open Sans", Helvetica, Arial, sans-serif;
+	font-family: Helvetica, Arial, sans-serif;
 	text-rendering: optimizeLegibility;
 	color: #444;
 }
+body.custom-font-enabled {
+	font-family: "Open Sans", Helvetica, Arial, sans-serif;
+}
 a {
 	outline: none;
 	color: #21759b;