diff --git a/source/includes/date-time-wrapper.php b/source/includes/date-time-wrapper.php
index faa6c79..2ffb03d 100644
--- a/source/includes/date-time-wrapper.php
+++ b/source/includes/date-time-wrapper.php
@@ -1,4 +1,10 @@
 <?php
+namespace MobilizonConnector;
+
+// Exit if this file is called directly.
+if (!defined('ABSPATH')) {
+  exit;
+}
 
 final class DateTimeWrapper {
   private $dateTime;
@@ -12,13 +18,13 @@ final class DateTimeWrapper {
     if (!$timeZone) {
       $timeZone = 'utc';
     }
-    $this->dateTime = new DateTime($text);
+    $this->dateTime = new \DateTime($text);
     $this->locale = $locale;
-    $this->timeZone = new DateTimeZone($timeZone);
+    $this->timeZone = new \DateTimeZone($timeZone);
   }
 
   public function getShortDate(): string {
-    $formatter = IntlDateFormatter::create($this->locale, IntlDateFormatter::SHORT, IntlDateFormatter::NONE, $this->timeZone);
+    $formatter = \IntlDateFormatter::create($this->locale, \IntlDateFormatter::SHORT, \IntlDateFormatter::NONE, $this->timeZone);
     return $formatter->format($this->dateTime);
   }
 
@@ -27,7 +33,7 @@ final class DateTimeWrapper {
   }
 
   public function get24Time(): string {
-    $formatter = IntlDateFormatter::create($this->locale, IntlDateFormatter::NONE, IntlDateFormatter::SHORT, $this->timeZone);
+    $formatter = \IntlDateFormatter::create($this->locale, \IntlDateFormatter::NONE, \IntlDateFormatter::SHORT, $this->timeZone);
     return $formatter->format($this->dateTime);
   }
 }
diff --git a/source/includes/formatter.php b/source/includes/formatter.php
index 1190d34..bff30c9 100644
--- a/source/includes/formatter.php
+++ b/source/includes/formatter.php
@@ -1,4 +1,11 @@
 <?php
+namespace MobilizonConnector;
+
+// Exit if this file is called directly.
+if (!defined('ABSPATH')) {
+  exit;
+}
+
 final class Formatter
 {
   public static function format_date(string $locale, string $timeZone, string $start, ?string $end, bool $isShortOffsetNameShown): string {
diff --git a/source/view/events-list-group-not-found.php b/source/view/events-list-group-not-found.php
index d9df67d..07a9bd2 100644
--- a/source/view/events-list-group-not-found.php
+++ b/source/view/events-list-group-not-found.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/events-list-not-loaded.php b/source/view/events-list-not-loaded.php
index 5b32b8e..5bf43d5 100644
--- a/source/view/events-list-not-loaded.php
+++ b/source/view/events-list-not-loaded.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/events-list-widget/form.php b/source/view/events-list-widget/form.php
index db614d4..1e7b1e9 100644
--- a/source/view/events-list-widget/form.php
+++ b/source/view/events-list-widget/form.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/events-list.php b/source/view/events-list.php
index 177b299..7d6df0a 100644
--- a/source/view/events-list.php
+++ b/source/view/events-list.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/settings/is-short-offset-name-shown-field.php b/source/view/settings/is-short-offset-name-shown-field.php
index f05f9bb..424a011 100644
--- a/source/view/settings/is-short-offset-name-shown-field.php
+++ b/source/view/settings/is-short-offset-name-shown-field.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/settings/page.php b/source/view/settings/page.php
index d873293..672b9db 100644
--- a/source/view/settings/page.php
+++ b/source/view/settings/page.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;
diff --git a/source/view/settings/url-field.php b/source/view/settings/url-field.php
index 053e30b..9d5f9b8 100644
--- a/source/view/settings/url-field.php
+++ b/source/view/settings/url-field.php
@@ -1,4 +1,6 @@
 <?php
+namespace MobilizonConnector;
+
 // Exit if this file is called directly.
 if (!defined('ABSPATH')) {
   exit;