diff --git a/phpBB/adm/style/captcha_recaptcha.html b/phpBB/adm/style/captcha_recaptcha.html
index 702a4a1099..586c494868 100644
--- a/phpBB/adm/style/captcha_recaptcha.html
+++ b/phpBB/adm/style/captcha_recaptcha.html
@@ -4,7 +4,8 @@
 		<script type="text/javascript">
 		// <![CDATA[
 		var RecaptchaOptions = {
-			lang : '{LA_RECAPTCHA_LANG}'
+			lang : '{LA_RECAPTCHA_LANG}',
+			theme : 'clean',
 		};
 		// ]]>
 		</script>