diff --git a/hkustthesis.dtx b/hkustthesis.dtx
index f2a13cc..cda4c0e 100644
--- a/hkustthesis.dtx
+++ b/hkustthesis.dtx
@@ -1661,6 +1661,8 @@ keywords         .clist_set:N = \l_@@_info_keywords_clist,
     \clearfield{arxivId}
     \clearfield{pmid}
     \clearfield{eprint}
+    \clearfield{urlyear}
+    \clearfield{urlmonth}
     \ifentrytype{online}{}{\ifentrytype{misc}{}{\clearfield{url}}}
     % \ifentrytype{book}{\clearfield{doi}}{}
 }