diff --git a/src/wp-includes/customize/class-wp-customize-themes-section.php b/src/wp-includes/customize/class-wp-customize-themes-section.php
index b112552e23..434feb3f30 100644
--- a/src/wp-includes/customize/class-wp-customize-themes-section.php
+++ b/src/wp-includes/customize/class-wp-customize-themes-section.php
@@ -81,7 +81,17 @@ class WP_Customize_Themes_Section extends WP_Customize_Section {
 						<?php $this->filter_bar_content_template(); ?>
 					</div>
 					<?php $this->filter_drawer_content_template(); ?>
-					<div class="error unexpected-error" style="display: none; "><p><?php _e( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' ); ?></p></div>
+					<div class="error unexpected-error" style="display: none; ">
+						<p>
+							<?php
+							printf(
+								/* translators: %s: support forums URL */
+								__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
+								__( 'https://wordpress.org/support/' )
+							);
+							?>
+						</p>
+					</div>
 					<ul class="themes">
 					</ul>
 					<p class="no-themes"><?php _e( 'No themes found. Try a different search.' ); ?></p>