diff --git a/koha-tmpl/intranet-tmpl/prog/en/xslt/MARC21slim2intranetDetail.xsl b/koha-tmpl/intranet-tmpl/prog/en/xslt/MARC21slim2intranetDetail.xsl
index c0360f2020..80fd69ace0 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/xslt/MARC21slim2intranetDetail.xsl
+++ b/koha-tmpl/intranet-tmpl/prog/en/xslt/MARC21slim2intranetDetail.xsl
@@ -64,7 +64,7 @@
                 <xsl:when test="$leader6='g'">VM</xsl:when>
                 <xsl:when test="$leader6='k'">PK</xsl:when>
                 <xsl:when test="$leader6='r'">OB</xsl:when>
-                <xsl:when test="$leader6='i'">SO</xsl:when>
+                <xsl:when test="$leader6='i'">MU</xsl:when>
                 <xsl:when test="$leader6='j'">MU</xsl:when>
                 <xsl:when test="$leader6='c' or $leader6='d'">PR</xsl:when>
             </xsl:choose>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
index be74affec9..d29c283bad 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
@@ -66,7 +66,7 @@
                 <xsl:when test="$leader6='g'">VM</xsl:when>
                 <xsl:when test="$leader6='k'">PK</xsl:when>
                 <xsl:when test="$leader6='r'">OB</xsl:when>
-                <xsl:when test="$leader6='i'">SO</xsl:when>
+                <xsl:when test="$leader6='i'">MU</xsl:when>
                 <xsl:when test="$leader6='j'">MU</xsl:when>
                 <xsl:when test="$leader6='c' or $leader6='d'">PR</xsl:when>
             </xsl:choose>