diff --git a/etc/zebradb/xsl/koha-indexdefs-to-zebra.xsl b/etc/zebradb/xsl/koha-indexdefs-to-zebra.xsl
index e12f73b192..dad8933149 100644
--- a/etc/zebradb/xsl/koha-indexdefs-to-zebra.xsl
+++ b/etc/zebradb/xsl/koha-indexdefs-to-zebra.xsl
@@ -169,7 +169,7 @@ definition file (probably something like {biblio,authority}-koha-indexdefs.xml)
                             <xslo:otherwise><xslo:text>notdefined</xslo:text></xslo:otherwise>
                         </xslo:choose>
                     </xslo:when>
-                    <xslo:otherwise><xslo:text>notdefined</xslo:text></xslo:otherwise>
+                    <xslo:otherwise><xslo:text>notspecified</xslo:text></xslo:otherwise>
                 </xslo:choose>
             </xslo:variable>
             <z:index>