diff --git a/Migrations/Mysql/Version20140505093853.php b/Migrations/Mysql/Version20140505093853.php
index d1aa1a3..2b1ea74 100644
--- a/Migrations/Mysql/Version20140505093853.php
+++ b/Migrations/Mysql/Version20140505093853.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Neos\Flow\Persistence\Doctrine\Migrations;
 
 use Doctrine\DBAL\Exception as DoctrineDBALException;
diff --git a/Migrations/Mysql/Version20160624203903.php b/Migrations/Mysql/Version20160624203903.php
index 96dcabd..db6fb3a 100644
--- a/Migrations/Mysql/Version20160624203903.php
+++ b/Migrations/Mysql/Version20160624203903.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Neos\Flow\Persistence\Doctrine\Migrations;
 
 use Doctrine\DBAL\Exception as DoctrineDBALException;
diff --git a/Migrations/Mysql/Version20210922110814.php b/Migrations/Mysql/Version20210922110814.php
index 7623464..72e3dd1 100644
--- a/Migrations/Mysql/Version20210922110814.php
+++ b/Migrations/Mysql/Version20210922110814.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Neos\Flow\Persistence\Doctrine\Migrations;
 
 use Doctrine\DBAL\Exception as DoctrineDBALException;