diff --git a/Application/Files/PiwikTracker.php b/Application/Files/PiwikTracker.php
index d7812de..fdda324 100644
--- a/Application/Files/PiwikTracker.php
+++ b/Application/Files/PiwikTracker.php
@@ -520,7 +520,7 @@ protected static function domainFixup($domain)
         if (strlen($domain) > 0) {
             $dl = strlen($domain) - 1;
             // remove trailing '.'
-            if ($domain{$dl} === '.') {
+            if ($domain[$dl] === '.') {
                 $domain = substr($domain, 0, $dl);
             }
             // remove leading '*'