diff --git a/custom/modules/digital_serial/modules/digital_serial_page/src/Form/SerialPageViewerForm.php b/custom/modules/digital_serial/modules/digital_serial_page/src/Form/SerialPageViewerForm.php
index 13bf0714..282912ec 100644
--- a/custom/modules/digital_serial/modules/digital_serial_page/src/Form/SerialPageViewerForm.php
+++ b/custom/modules/digital_serial/modules/digital_serial_page/src/Form/SerialPageViewerForm.php
@@ -222,7 +222,7 @@ public function buildForm(array $form, FormStateInterface $form_state, SerialTit
    * Determines if the current browser supports huge canvases.
    */
   private static function browserSupportsHugeCanvas($browser) {
-    return !stripos($browser, 'Safari') === FALSE;
+    return !str_contains(strtolower($browser), 'safari');
   }
 
   /**