diff --git a/university-of-york-harvard-environment.csl b/university-of-york-harvard-environment.csl
index c65f9730e9c..886376b95f9 100644
--- a/university-of-york-harvard-environment.csl
+++ b/university-of-york-harvard-environment.csl
@@ -38,7 +38,7 @@
   </macro>
   <macro name="author-short">
     <names variable="author">
-      <name form="short" font-style="normal" delimiter=","/>
+      <name form="short" font-style="normal"/>
       <et-al font-style="normal"/>
       <substitute>
         <names variable="translator"/>