diff --git a/src/wp-admin/customize.php b/src/wp-admin/customize.php
index aa949e5440..1195e9ad5d 100644
--- a/src/wp-admin/customize.php
+++ b/src/wp-admin/customize.php
@@ -132,7 +132,7 @@ do_action( 'customize_controls_print_scripts' );
 			<div id="customize-info" class="accordion-section customize-info">
 				<div class="accordion-section-title">
 					<span class="preview-notice"><?php
-						echo sprintf( __( 'You are customizing %s' ), '<strong class="panel-title site-title">' . get_bloginfo( 'name' ) . '</strong>' );
+						echo sprintf( __( 'You are customizing %s' ), '<strong class="panel-title site-title">' . __( 'Loading&hellip;' ) . '</strong>' );
 					?></span>
 					<button class="customize-help-toggle dashicons dashicons-editor-help" aria-expanded="false"><span class="screen-reader-text"><?php _e( 'Help' ); ?></span></button>
 				</div>
diff --git a/src/wp-admin/js/customize-controls.js b/src/wp-admin/js/customize-controls.js
index a6ede2713e..0abfb775bd 100644
--- a/src/wp-admin/js/customize-controls.js
+++ b/src/wp-admin/js/customize-controls.js
@@ -3604,8 +3604,12 @@
 
 		// Bind site title display to the corresponding field.
 		if ( title.length ) {
-			$( '#customize-control-blogname input' ).on( 'input', function() {
-				title.text( this.value );
+			api( 'blogname', function( setting ) {
+				var updateTitle = function() {
+					title.text( $.trim( setting() ) || api.l10n.untitledBlogName );
+				};
+				setting.bind( updateTitle );
+				updateTitle();
 			} );
 		}
 
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 74035d9917..b717fd7fc3 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -443,6 +443,7 @@ function wp_default_scripts( &$scripts ) {
 		'loginIframeTitle'   => __( 'Session expired' ),
 		'collapseSidebar'    => __( 'Collapse Sidebar' ),
 		'expandSidebar'      => __( 'Expand Sidebar' ),
+		'untitledBlogName'   => __( '(Untitled)' ),
 		// Used for overriding the file types allowed in plupload.
 		'allowedFiles'       => __( 'Allowed Files' ),
 	) );