diff --git a/C4/AuthoritiesMarc.pm b/C4/AuthoritiesMarc.pm
index 07b6140a03..3e90252615 100644
--- a/C4/AuthoritiesMarc.pm
+++ b/C4/AuthoritiesMarc.pm
@@ -285,9 +285,9 @@ sub SearchAuthorities {
         } elsif ($sortby eq 'HeadingDsc') {
             $orderstring = '@attr 7=2 @attr 1=Heading 0';
         } elsif ($sortby eq 'AuthidAsc') {
-            $orderstring = '@attr 7=1 @attr 1=Local-Number 0';
+            $orderstring = '@attr 7=1 @attr 4=109 @attr 1=Local-Number 0';
         } elsif ($sortby eq 'AuthidDsc') {
-            $orderstring = '@attr 7=2 @attr 1=Local-Number 0';
+            $orderstring = '@attr 7=2 @attr 4=109 @attr 1=Local-Number 0';
         }
         $query=($query?$query:"\@attr 1=_ALLRECORDS \@attr 2=103 ''");
         $query="\@or $orderstring $query" if $orderstring;
diff --git a/etc/zebradb/marc_defs/marc21/authorities/authority-koha-indexdefs.xml b/etc/zebradb/marc_defs/marc21/authorities/authority-koha-indexdefs.xml
index f1013e18ca..dedf1455a0 100644
--- a/etc/zebradb/marc_defs/marc21/authorities/authority-koha-indexdefs.xml
+++ b/etc/zebradb/marc_defs/marc21/authorities/authority-koha-indexdefs.xml
@@ -23,6 +23,7 @@ authority-zebra-indexdefs.xsl`
   <!-- Original record ID -->
   <kohaidx:index_control_field tag="001">
     <kohaidx:target_index>Local-Number:w</kohaidx:target_index>
+    <kohaidx:target_index>Local-Number:n</kohaidx:target_index>
     <kohaidx:target_index>Local-Number:s</kohaidx:target_index>
   </kohaidx:index_control_field>
   
diff --git a/etc/zebradb/marc_defs/marc21/authorities/authority-zebra-indexdefs.xsl b/etc/zebradb/marc_defs/marc21/authorities/authority-zebra-indexdefs.xsl
index aa02e70292..1687a74ab4 100644
--- a/etc/zebradb/marc_defs/marc21/authorities/authority-zebra-indexdefs.xsl
+++ b/etc/zebradb/marc_defs/marc21/authorities/authority-zebra-indexdefs.xsl
@@ -46,7 +46,7 @@ authority-zebra-indexdefs.xsl` (substituting the appropriate file names).
     </z:index>
   </xslo:template>
   <xslo:template match="marc:controlfield[@tag='001']">
-    <z:index name="Local-Number:w Local-Number:s">
+    <z:index name="Local-Number:w Local-Number:n Local-Number:s">
       <xslo:value-of select="."/>
     </z:index>
   </xslo:template>
diff --git a/etc/zebradb/marc_defs/marc21/authorities/record.abs b/etc/zebradb/marc_defs/marc21/authorities/record.abs
index 23d75a2fda..df2b16ebee 100644
--- a/etc/zebradb/marc_defs/marc21/authorities/record.abs
+++ b/etc/zebradb/marc_defs/marc21/authorities/record.abs
@@ -11,7 +11,7 @@ systag sysno rank
 xpath enable
 
 all any
-melm 001 Local-Number,Local-Number:s
+melm 001 Local-Number,Local-Number:n,Local-Number:s
 melm 942$a authtype:w,authtype:p
 
 # Personal Name
diff --git a/etc/zebradb/marc_defs/unimarc/authorities/record.abs b/etc/zebradb/marc_defs/unimarc/authorities/record.abs
index 18245c0036..c6ed01ffd1 100644
--- a/etc/zebradb/marc_defs/unimarc/authorities/record.abs
+++ b/etc/zebradb/marc_defs/unimarc/authorities/record.abs
@@ -11,7 +11,7 @@ systag sysno rank
 xpath enable
 
 all any
-melm 001 Local-Number,Local-Number:s
+melm 001 Local-Number,Local-Number:n,Local-Number:s
 melm 942$a authtype
 melm 152$b authtype:w,authtype:p