diff --git a/koha-tmpl/intranet-tmpl/prog/en/xslt/UNIMARCslim2intranetDetail.xsl b/koha-tmpl/intranet-tmpl/prog/en/xslt/UNIMARCslim2intranetDetail.xsl
index 361b88c10c..5f6e2b1782 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/xslt/UNIMARCslim2intranetDetail.xsl
+++ b/koha-tmpl/intranet-tmpl/prog/en/xslt/UNIMARCslim2intranetDetail.xsl
@@ -19,7 +19,7 @@
   <xsl:variable name="leader" select="marc:leader"/>
   <xsl:variable name="leader6" select="substring($leader,7,1)"/>
   <xsl:variable name="leader7" select="substring($leader,8,1)"/>
-  <xsl:variable name="biblionumber" select="marc:datafield[@tag=090]/marc:subfield[@code='a']"/>
+  <xsl:variable name="biblionumber" select="marc:controlfield[@tag=001]"/>
 
 
   <xsl:if test="marc:datafield[@tag=200]">
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACDetail.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACDetail.xsl
index efd8c793a2..13f95a0378 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACDetail.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACDetail.xsl
@@ -18,7 +18,7 @@
   <xsl:variable name="leader" select="marc:leader"/>
   <xsl:variable name="leader6" select="substring($leader,7,1)"/>
   <xsl:variable name="leader7" select="substring($leader,8,1)"/>
-  <xsl:variable name="biblionumber" select="marc:datafield[@tag=090]/marc:subfield[@code='a']"/>
+  <xsl:variable name="biblionumber" select="marc:controlfield[@tag=001]"/>
   <xsl:variable name="DisplayOPACiconsXSLT" select="marc:sysprefs/marc:syspref[@name='DisplayOPACiconsXSLT']"/>
   <xsl:variable name="OPACURLOpenInNewWindow" select="marc:sysprefs/marc:syspref[@name='OPACURLOpenInNewWindow']"/>
   <xsl:variable name="URLLinkText" select="marc:sysprefs/marc:syspref[@name='URLLinkText']"/>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACResults.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACResults.xsl
index 2174d5d935..3279def752 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACResults.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/UNIMARCslim2OPACResults.xsl
@@ -23,10 +23,8 @@
   <xsl:variable name="leader" select="marc:leader"/>
   <xsl:variable name="leader6" select="substring($leader,7,1)"/>
   <xsl:variable name="leader7" select="substring($leader,8,1)"/>
-  <xsl:variable name="biblionumber"
-   select="marc:datafield[@tag=090]/marc:subfield[@code='a']"/>
-  <xsl:variable name="isbn"
-   select="marc:datafield[@tag=010]/marc:subfield[@code='a']"/>
+  <xsl:variable name="biblionumber" select="marc:controlfield[@tag=001]"/>
+  <xsl:variable name="isbn" select="marc:datafield[@tag=010]/marc:subfield[@code='a']"/>
   <xsl:variable name="OPACResultsLibrary" select="marc:sysprefs/marc:syspref[@name='OPACResultsLibrary']"/>
   <xsl:variable name="BiblioDefaultView" select="marc:sysprefs/marc:syspref[@name='BiblioDefaultView']"/>
   <xsl:variable name="hidelostitems" select="marc:sysprefs/marc:syspref[@name='hidelostitems']"/>