diff --git a/american-phytopathological-society.csl b/american-phytopathological-society.csl
index 998736fa1c..93aa100f0d 100644
--- a/american-phytopathological-society.csl
+++ b/american-phytopathological-society.csl
@@ -108,7 +108,7 @@
       </else>
     </choose>
   </macro>
-  <citation et-al-min="3" et-al-use-first="1" disambiguate-add-year-suffix="true" disambiguate-add-names="true" disambiguate-add-givenname="true" collapse="year">
+  <citation et-al-min="3" et-al-use-first="1" disambiguate-add-year-suffix="true" collapse="year">
     <layout prefix="(" suffix=")" delimiter="; ">
       <group delimiter=", ">
         <group delimiter=" ">