Index: src/wp-content/themes/twentyfourteen/functions.php
===================================================================
--- src/wp-content/themes/twentyfourteen/functions.php	(revision 29747)
+++ src/wp-content/themes/twentyfourteen/functions.php	(working copy)
@@ -211,7 +211,11 @@
 	 * by Lato, translate this to 'off'. Do not translate into your own language.
 	 */
 	if ( 'off' !== _x( 'on', 'Lato font: on or off', 'twentyfourteen' ) ) {
-		$font_url = add_query_arg( 'family', urlencode( 'Lato:300,400,700,900,300italic,400italic,700italic' ), "//fonts.googleapis.com/css" );
+		$query_args = array(
+			'family' => urlencode( 'Lato:300,400,700,900,300italic,400italic,700italic' ),
+			'subset' => urlencode( 'latin,latin-ext' ),
+		);
+		$font_url = add_query_arg( $query_args, "//fonts.googleapis.com/css" );
 	}
 
 	return $font_url;