diff --git a/config.json b/config.json
index f51f45b13..1025289e8 100644
--- a/config.json
+++ b/config.json
@@ -120,7 +120,14 @@
         "istex": {
             "host": "/",
             "title": "Services",
-            "summary": "Les technologies et les outils ISTEX pour les projets de recherche."
+            "summary": "Les technologies et les outils ISTEX pour les projets de recherche.",
+            "matomoID": "39"
+        },
+        "istex-legacy": {
+            "host": "/",
+            "title": "Services",
+            "summary": "Les technologies et les outils ISTEX pour les projets de recherche.",
+            "matomoID": "39"
         },
         "inist": {
             "title": "Etudes"
diff --git a/src/app/custom/themes/istex-legacy/index.html b/src/app/custom/themes/istex-legacy/index.ejs
similarity index 94%
rename from src/app/custom/themes/istex-legacy/index.html
rename to src/app/custom/themes/istex-legacy/index.ejs
index 9d96cdd1c..1be386684 100644
--- a/src/app/custom/themes/istex-legacy/index.html
+++ b/src/app/custom/themes/istex-legacy/index.ejs
@@ -87,10 +87,10 @@
             </a>
             <div id="pageText" class="pageHead-texte">
                 <div id="pageTitle">
-                        <%= theme.title %>
+                        <%= custom.title %>
                 </div>
                 <p id="pageSubTitle" class="text-center">
-                    <%= theme.summary %>
+                    <%= custom.summary %>
                 </p>
             </div>
         </div>
@@ -117,13 +117,16 @@
             </div>
         </footer>
         <!-- Footer - bloc-8 END -->
-        <script
-            src="https://code.jquery.com/jquery-3.6.0.min.js"
-            integrity="sha256-/xUj+3OJU5yExlq6GSYGSHk7tPXikynS7ogEvDej/m4="
-            crossorigin="anonymous"></script>
-        <script src="/js/responsiveMenu.js"></script>
-        <script src="/js/tooltip.js"></script>
-         <!-- Piwik -->
+	<script src="<%= theme.base.href %>/themes/istex/js/jquery-3.6.0.min.js"></script>
+	<script src="<%= theme.base.href %>/themes/istex/js/responsiveMenu.js"></script>
+	<script src="<%= theme.base.href %>/themes/istex/js/tooltip.js"></script>
+	<script>
+	    window.__PRELOADED_STATE__ = <%- lodex.preload %>;
+	    window.__TENANT__ = '<%= lodex.tenant %>';
+	    window.ISTEX_API_URL = '<%= lodex.istexApi %>';
+	</script>
+	<script src="<%= lodex.base.href %>/index.js"></script>
+  	<!-- Piwik -->
         <script>
             var _paq = _paq || [];
             _paq.push([
@@ -146,7 +149,7 @@
             (function () {
                 var u = "https://piwik2.inist.fr/";
                 _paq.push(["setTrackerUrl", u + "piwik.php"]);
-                _paq.push(["setSiteId", "39"]);
+                _paq.push(["setSiteId", "<%= custom.matomoID %>"]);
                 var d = document,
                     g = d.createElement("script"),
                     s = d.getElementsByTagName("script")[0];
diff --git a/src/app/custom/themes/istex-legacy/lodex-theme.json b/src/app/custom/themes/istex-legacy/lodex-theme.json
index 4ec6496f1..939f5157c 100644
--- a/src/app/custom/themes/istex-legacy/lodex-theme.json
+++ b/src/app/custom/themes/istex-legacy/lodex-theme.json
@@ -1,5 +1,5 @@
 {
-    "version": "2",
+    "version": "3",
     "restricted": true,
     "name": {
         "fr": "ISTEX",
@@ -12,7 +12,7 @@
     "files": {
         "theme": {
             "main": "customTheme.js",
-            "index": "index.html"
+            "index": "index.ejs"
         }
     }
 }
diff --git a/src/app/custom/themes/istex/index.ejs b/src/app/custom/themes/istex/index.ejs
index 8620006f6..05bd4c0dd 100644
--- a/src/app/custom/themes/istex/index.ejs
+++ b/src/app/custom/themes/istex/index.ejs
@@ -107,6 +107,41 @@
     window.__TENANT__ = '<%= lodex.tenant %>';
     window.ISTEX_API_URL = '<%= lodex.istexApi %>';
 </script>
-<script src="<%= lodex.base.href %>/index.js"></script>
-</body>
-</html>
\ No newline at end of file
+<script src="<%= lodex.base.href %>/index.js"></script>       
+<!-- Piwik -->
+        <script>
+            var _paq = _paq || [];
+            _paq.push([
+                function () {
+                    var self = this;
+                    function getOriginalVisitorCookieTimeout() {
+                        var now = new Date(),
+                            nowTs = Math.round(now.getTime() / 1000),
+                            visitorInfo = self.getVisitorInfo();
+                        var createTs = parseInt(visitorInfo[2]);
+                        var cookieTimeout = 33696000;
+                        var originalTimeout = createTs + cookieTimeout - nowTs;
+                        return originalTimeout;
+                    }
+                    this.setVisitorCookieTimeout(getOriginalVisitorCookieTimeout());
+                }
+            ]);
+            _paq.push(["trackPageView"]);
+            _paq.push(["enableLinkTracking"]);
+            (function () {
+                var u = "https://piwik2.inist.fr/";
+                _paq.push(["setTrackerUrl", u + "piwik.php"]);
+                _paq.push(["setSiteId", "<%= custom.matomoID %>"]);
+                var d = document,
+                    g = d.createElement("script"),
+                    s = d.getElementsByTagName("script")[0];
+                g.type = "text/javascript";
+                g.async = true;
+                g.defer = true;
+                g.src = u + "piwik.js";
+                s.parentNode.insertBefore(g, s);
+            })();
+        </script>
+    <!-- End Piwik Code -->
+    </body>
+</html>