diff --git a/src/wp-includes/customize/class-wp-customize-site-icon-control.php b/src/wp-includes/customize/class-wp-customize-site-icon-control.php
index ee2504e834..5863f6e382 100644
--- a/src/wp-includes/customize/class-wp-customize-site-icon-control.php
+++ b/src/wp-includes/customize/class-wp-customize-site-icon-control.php
@@ -63,7 +63,7 @@ class WP_Customize_Site_Icon_Control extends WP_Customize_Cropped_Image_Control
 			<div class="container">
 				<div class="site-icon-preview">
 					<div class="favicon-preview">
-						<img src="images/browser.png" class="browser-preview" width="182" alt="<?php esc_attr_e( 'Browser interface preview' ); ?>" />
+						<img src="<?php echo esc_url( admin_url( 'images/browser.png' ) ); ?>" class="browser-preview" width="182" alt="<?php esc_attr_e( 'Browser interface preview' ); ?>" />
 
 						<div class="favicon">
 							<img id="preview-favicon" src="{{ data.attachment.sizes.full.url }}" alt="<?php esc_attr_e( 'Preview as a browser icon' ); ?>"/>