diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
index 4cec982e9a..20833ce0b7 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACDetail.xsl
@@ -6,6 +6,7 @@
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:str="http://exslt.org/strings"
   exclude-result-prefixes="marc items">
     <xsl:import href="MARC21slimUtils.xsl"/>
     <xsl:output method = "html" indent="yes" omit-xml-declaration = "yes" encoding="UTF-8"/>
@@ -828,10 +829,10 @@
 	    <a property="url">
 	    <xsl:choose>
 	      <xsl:when test="$OPACTrackClicks='track'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:when test="$OPACTrackClicks='anonymous'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:otherwise>
                 <xsl:attribute name="href"><xsl:value-of select="marc:subfield[@code='u']"/></xsl:attribute>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACResults.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACResults.xsl
index 383ccb3afc..01e3c1c058 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACResults.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/MARC21slim2OPACResults.xsl
@@ -5,6 +5,7 @@
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:str="http://exslt.org/strings"
   exclude-result-prefixes="marc items">
     <xsl:import href="MARC21slimUtils.xsl"/>
     <xsl:output method = "html" indent="yes" omit-xml-declaration = "yes" encoding="UTF-8"/>
@@ -1020,10 +1021,10 @@
 			      <a>
 			      <xsl:choose>
 			        <xsl:when test="$OPACTrackClicks='track'">
-				  <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+                      <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 				</xsl:when>
 	                        <xsl:when test="$OPACTrackClicks='anonymous'">
-		                  <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+                      <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 				</xsl:when>
 				<xsl:otherwise>
 				  <xsl:attribute name="href"><xsl:value-of select="marc:subfield[@code='u']"/></xsl:attribute>
@@ -1055,10 +1056,10 @@
                                    <a target='_blank'>
 				   <xsl:choose>
 				     <xsl:when test="$OPACTrackClicks='track'">
-				       <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+                      <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 				     </xsl:when>
 				     <xsl:when test="$OPACTrackClicks='anonymous'">
-				       <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+                      <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 				     </xsl:when>
 				     <xsl:otherwise>
 		                       <xsl:attribute name="href"><xsl:value-of select="marc:subfield[@code='u']"/></xsl:attribute>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACDetail.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACDetail.xsl
index 4d1785b919..1f1e26c8dd 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACDetail.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACDetail.xsl
@@ -7,6 +7,7 @@
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:str="http://exslt.org/strings"
   exclude-result-prefixes="marc items">
     <xsl:import href="NORMARCslimUtils.xsl"/>
     <xsl:output method = "html" indent="yes" omit-xml-declaration = "yes" encoding="UTF-8"/>
@@ -488,10 +489,10 @@
 	    <a property="url">
 	    <xsl:choose>
 	      <xsl:when test="$OPACTrackClicks='track'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:when test="$OPACTrackClicks='anonymous'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:otherwise>
                 <xsl:attribute name="href"><xsl:value-of select="marc:subfield[@code='u']"/></xsl:attribute>
diff --git a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACResults.xsl b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACResults.xsl
index 163b3aa168..3cdcd0e4a1 100644
--- a/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACResults.xsl
+++ b/koha-tmpl/opac-tmpl/bootstrap/en/xslt/NORMARCslim2OPACResults.xsl
@@ -7,6 +7,7 @@
   xmlns:marc="http://www.loc.gov/MARC21/slim"
   xmlns:items="http://www.koha-community.org/items"
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:str="http://exslt.org/strings"
   exclude-result-prefixes="marc items">
     <xsl:import href="NORMARCslimUtils.xsl"/>
     <xsl:output method = "html" indent="yes" omit-xml-declaration = "yes" encoding="UTF-8"/>
@@ -793,10 +794,10 @@
 	    <a property="url">
 	    <xsl:choose>
 	      <xsl:when test="$OPACTrackClicks='track'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:when test="$OPACTrackClicks='anonymous'">
-	        <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="marc:subfield[@code='u']"/>;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
+            <xsl:attribute name="href">/cgi-bin/koha/tracklinks.pl?uri=<xsl:value-of select="str:encode-uri(marc:subfield[@code='u'], true())"/>&amp;biblionumber=<xsl:value-of select="$biblionumber"/></xsl:attribute>
 	      </xsl:when>
 	      <xsl:otherwise>
                 <xsl:attribute name="href"><xsl:value-of select="marc:subfield[@code='u']"/></xsl:attribute>