diff --git a/etc/zebradb/marc_defs/unimarc/biblios/biblio-koha-indexdefs.xml b/etc/zebradb/marc_defs/unimarc/biblios/biblio-koha-indexdefs.xml
index 6b5bdaeddd..9daeecfe27 100644
--- a/etc/zebradb/marc_defs/unimarc/biblios/biblio-koha-indexdefs.xml
+++ b/etc/zebradb/marc_defs/unimarc/biblios/biblio-koha-indexdefs.xml
@@ -1245,7 +1245,7 @@
     <target_index>Subject:p</target_index>
   </index_data_field>
   <!--610 - Free-->
-  <index_subfields tag="608" subfields="9">
+  <index_subfields tag="610" subfields="9">
     <target_index>Koha-Auth-Number:w</target_index>
     <target_index>Koha-Auth-Number:n</target_index>
   </index_subfields>
diff --git a/etc/zebradb/marc_defs/unimarc/biblios/biblio-zebra-indexdefs.xsl b/etc/zebradb/marc_defs/unimarc/biblios/biblio-zebra-indexdefs.xsl
index 9aa1f76e85..9f0776cac5 100644
--- a/etc/zebradb/marc_defs/unimarc/biblios/biblio-zebra-indexdefs.xsl
+++ b/etc/zebradb/marc_defs/unimarc/biblios/biblio-zebra-indexdefs.xsl
@@ -1747,6 +1747,8 @@ definition file (probably something like {biblio,authority}-koha-indexdefs.xml)
         </z:index>
       </xslo:if>
     </xslo:for-each>
+  </xslo:template>
+  <xslo:template mode="index_subfields" match="marc:datafield[@tag='610']">
     <xslo:for-each select="marc:subfield">
       <xslo:if test="contains('9', @code)">
         <z:index name="Koha-Auth-Number:w Koha-Auth-Number:n">