diff --git a/example/lib/main.dart b/example/lib/main.dart
index 9d7c395..1063d44 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -7,7 +7,7 @@ import 'package:url_launcher/url_launcher.dart';
 // See the docker folder for instructions on how to get a
 // test Matomo instance running
 const _matomoEndpoint = 'http://localhost:8765/matomo.php';
-const _sideId = 1;
+const _sideId = "1";
 const _testUserId = 'Nelson Pandela';
 
 // Use this as dispatchSettings in MatomoTracker.instance.initialize()
diff --git a/lib/src/matomo.dart b/lib/src/matomo.dart
index f9bb212..6c05fab 100644
--- a/lib/src/matomo.dart
+++ b/lib/src/matomo.dart
@@ -55,7 +55,7 @@ class MatomoTracker {
   /// The ID of the website we're tracking a visit/action for.
   ///
   /// Corresponds with `idsite`.
-  late final int siteId;
+  late final String siteId;
 
   /// The url of the Matomo endpoint.
   ///
@@ -205,7 +205,7 @@ class MatomoTracker {
   /// It is recommended to leave [userAgent] to `null` so it will be detected
   /// automatically.
   Future<void> initialize({
-    required int siteId,
+    required String siteId,
     required String url,
     bool newVisit = true,
     String? visitorId,
diff --git a/lib/src/matomo_action.dart b/lib/src/matomo_action.dart
index f92afa0..3c34639 100644
--- a/lib/src/matomo_action.dart
+++ b/lib/src/matomo_action.dart
@@ -206,7 +206,7 @@ class MatomoAction {
 
     return {
       // Required parameters
-      'idsite': tracker.siteId.toString(),
+      'idsite': tracker.siteId,
       'rec': '1',
 
       if (nV != null && nV) 'new_visit': '1',
diff --git a/test/ressources/mock/data.dart b/test/ressources/mock/data.dart
index c0387f7..4760d6d 100644
--- a/test/ressources/mock/data.dart
+++ b/test/ressources/mock/data.dart
@@ -119,7 +119,7 @@ const matomoDispatcherToken = 'token';
 
 // MatomoTracker
 const matomoTrackerContentBase = 'contentBase';
-const matomoTrackerSiteId = 1;
+const matomoTrackerSiteId = "1";
 const matomoTrackerScreenResolution = Size(200, 200);
 const matomoTrackerUrl = 'https://example.com';
 const matomoTrackerContentBaseUrl = 'https://example.com';