diff --git a/elements/radicalmultifieldtreecatalog.php b/elements/radicalmultifieldtreecatalog.php
index b15f5ce..c2bcd0a 100644
--- a/elements/radicalmultifieldtreecatalog.php
+++ b/elements/radicalmultifieldtreecatalog.php
@@ -152,7 +152,10 @@ public function getInput($only_directories = false)
         Text::script('PLG_RADICAL_MULTI_FIELD_BUTTON_LIST');
         Text::script('PLG_RADICAL_MULTI_FIELD_BUTTON_SELECTALL');
 
-		$app = Factory::getApplication();
+        // Add the root url as JS var
+        Factory::getDocument()->addScriptDeclaration("let siteUrl = '".JUri::root()."';");
+
+        $app = Factory::getApplication();
 
 		// get attributes
 		$importfield = $this->getAttribute('importfield');
diff --git a/media/core/js/import.js b/media/core/js/import.js
index 93996b4..11d52a6 100644
--- a/media/core/js/import.js
+++ b/media/core/js/import.js
@@ -111,7 +111,7 @@ jQuery(function(){
         list.find('.av-folderlist-label').removeClass('selected');
         jQuery(this).addClass('selected');
         listfiles.html('');
-        jQuery.get("/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=json&type=get_files&directory=" + encodeURIComponent(self.attr('path')) +
+        jQuery.get(siteUrl + "/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=json&type=get_files&directory=" + encodeURIComponent(self.attr('path')) +
             "&importfieldpath=" + encodeURIComponent(importfieldpath) +
             "&importfield=" + encodeURIComponent(importfield)
         ).done(function (response) {
@@ -290,7 +290,7 @@ jQuery(function(){
             callback: function (value) {
                 let newName = value;
                 if (newName) {
-                    jQuery.get("/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=raw&type=create_directory&name=" +
+                    jQuery.get(siteUrl + "/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=raw&type=create_directory&name=" +
                         encodeURIComponent(newName) +
                         "&path=" + encodeURIComponent(active.find('.av-folderlist-label').attr('path')) +
                         "&importfieldpath=" + encodeURIComponent(importfieldpath) +
@@ -315,7 +315,7 @@ jQuery(function(){
     jQuery('.modal-import-file .tree-reload').on('click', function() {
         let lastActive = active.find('.av-folderlist-label').attr('path');
         let bufferScrollTop = jQuery('.av-folderlist').scrollTop();
-        jQuery.get("/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=raw&type=get_directories" +
+        jQuery.get(siteUrl + "/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=raw&type=get_directories" +
             "&importfieldpath=root" +
             "&importfield=" + encodeURIComponent(importfield)
         ).done(function (response) {
@@ -660,7 +660,7 @@ jQuery(function(){
         }
 
 
-        let url = "/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=json&type=upload_file"
+        let url = siteUrl + "/administrator/index.php?option=com_ajax&plugin=radicalmultifield&group=fields&format=json&type=upload_file"
             + "&importfieldpath=" + encodeURIComponent(importfieldpath)
             + "&importfield=" + encodeURIComponent(importfield);
         let xhr = new XMLHttpRequest();