diff --git a/phpBB/styles/subsilver2/template/ucp_agreement.html b/phpBB/styles/subsilver2/template/ucp_agreement.html
index 74c3d02dc7..3afe6e89a0 100644
--- a/phpBB/styles/subsilver2/template/ucp_agreement.html
+++ b/phpBB/styles/subsilver2/template/ucp_agreement.html
@@ -10,8 +10,8 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
-		document.forms['register'].language.value = lang_iso;
 		document.forms['register'].submit();
 	}
 
diff --git a/phpBB/styles/subsilver2/template/ucp_register.html b/phpBB/styles/subsilver2/template/ucp_register.html
index 1ab094d2f4..1d55b952e5 100644
--- a/phpBB/styles/subsilver2/template/ucp_register.html
+++ b/phpBB/styles/subsilver2/template/ucp_register.html
@@ -7,8 +7,8 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
-		document.forms['register'].language.value = lang_iso;
 		document.forms['register'].submit.click();
 	}