diff --git a/csl/waterresearch.csl b/csl/waterresearch.csl
index 1209ae17dd..057edca7c6 100644
--- a/csl/waterresearch.csl
+++ b/csl/waterresearch.csl
@@ -8,7 +8,7 @@
       <name>Julian Onions</name>
       <email>julian.onions@gmail.com</email>
     </author>
-    <updated></updated>
+    <updated/>
     <summary>Style for Water Research.</summary>
     <link href="http://www.elsevier.com/wps/find/journaldescription.cws_home/309/authorinstructions?navopenmenu=4" rel="documentation"/>
     <category label="Water Research" term="author-date"/>