diff --git a/wp-includes/customize/class-wp-customize-theme-control.php b/wp-includes/customize/class-wp-customize-theme-control.php
index 13b803ac60..6b86ce84de 100644
--- a/wp-includes/customize/class-wp-customize-theme-control.php
+++ b/wp-includes/customize/class-wp-customize-theme-control.php
@@ -117,7 +117,7 @@ class WP_Customize_Theme_Control extends WP_Customize_Control {
 				<div class="theme-id-container">
 					<h3 class="theme-name" id="{{ data.section }}-{{ data.theme.id }}-name">{{ data.theme.name }}</h3>
 					<div class="theme-actions">
-						<button type="button" class="button button-primary preview-theme" aria-label="<?php echo esc_attr( $preview_label ); ?>" data-slug="{{ data.theme.id }}"><?php _e( 'Live Preview' ); ?></span>
+						<button type="button" class="button button-primary preview-theme" aria-label="<?php echo esc_attr( $preview_label ); ?>" data-slug="{{ data.theme.id }}"><?php _e( 'Live Preview' ); ?></button>
 					</div>
 				</div>
 				<div class="notice notice-success notice-alt"><p><?php _ex( 'Installed', 'theme' ); ?></p></div>
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 784cbf9227..690e65432a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-43162';
+$wp_version = '5.0-alpha-43166';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.