diff --git a/src/pvv/side/activity.php b/src/pvv/side/activity.php
index 8d81dcc..6799d4f 100644
--- a/src/pvv/side/activity.php
+++ b/src/pvv/side/activity.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php //declare(strict_types=1);
 namespace pvv\side;
 
 use \DateTime;
diff --git a/src/pvv/side/event.php b/src/pvv/side/event.php
index c00904c..9b10eb1 100644
--- a/src/pvv/side/event.php
+++ b/src/pvv/side/event.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php //declare(strict_types=1);
 namespace pvv\side;
 
 interface Event extends Activity {
diff --git a/src/pvv/side/repeatingactivity.php b/src/pvv/side/repeatingactivity.php
index d1a60c9..9ad3e7c 100644
--- a/src/pvv/side/repeatingactivity.php
+++ b/src/pvv/side/repeatingactivity.php
@@ -1,4 +1,4 @@
-<?php declare(strict_types=1);
+<?php //declare(strict_types=1);
 namespace pvv\side;
 
 use \DateTime;