diff --git a/journal-of-the-royal-society-of-western-australia.csl b/journal-of-the-royal-society-of-western-australia.csl
index c4154ff82b5..4cf5e8fd74b 100644
--- a/journal-of-the-royal-society-of-western-australia.csl
+++ b/journal-of-the-royal-society-of-western-australia.csl
@@ -202,6 +202,7 @@
   <bibliography name-delimiter=", " and="symbol" et-al-min="11" et-al-use-first="7" hanging-indent="true">
     <sort>
       <key macro="author"/>
+      <key macro="year"/>
       <key variable="title"/>
     </sort>
     <layout>