diff --git a/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl b/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl
index 0682ae0161..2c6a1a82a9 100755
--- a/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl
+++ b/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACDetail.xsl
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- $Id: MARC21slim2DC.xsl,v 1.1 2003/01/06 08:20:27 adam Exp $ -->
+<!DOCTYPE stylesheet [<!ENTITY nbsp "&#160;" >]>
 <xsl:stylesheet version="1.0"
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"
diff --git a/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACResults.xsl b/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACResults.xsl
index a8121c1cb1..75d838e29e 100644
--- a/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACResults.xsl
+++ b/koha-tmpl/opac-tmpl/prog/en/xslt/MARC21slim2OPACResults.xsl
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!-- $Id: MARC21slim2DC.xsl,v 1.1 2003/01/06 08:20:27 adam Exp $ -->
+<!DOCTYPE stylesheet [<!ENTITY nbsp "&#160;" >]>
 <xsl:stylesheet version="1.0"
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"