diff --git a/src/wp-includes/customize/class-wp-customize-theme-control.php b/src/wp-includes/customize/class-wp-customize-theme-control.php
index 13b803ac60..6b86ce84de 100644
--- a/src/wp-includes/customize/class-wp-customize-theme-control.php
+++ b/src/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>