diff --git a/var/www/common.php b/var/www/common.php
index a5a1f54..856b68f 100644
--- a/var/www/common.php
+++ b/var/www/common.php
@@ -22,6 +22,7 @@ const ADMIN_PASSWORD='MY_PASSWORD'; //password for admin interface
 const SERVICE_INSTANCES=['2', '3', '4', '5', '6', '7', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'];
 const DISABLED_PHP_VERSIONS=[];
 const PHP_VERSIONS=[4 => '7.3'];
+const DEFAULT_PHP_VERSION='7.3';
 const PHP_CONFIG='memory_limit = 256M
 error_reporting = E_ALL
 post_max_size = 10G
diff --git a/var/www/html/register.php b/var/www/html/register.php
index f33a9f2..d72dfc5 100644
--- a/var/www/html/register.php
+++ b/var/www/html/register.php
@@ -147,10 +147,9 @@ echo '<tr><td>PHP version</td><td><select name="php">
 <option value="0"';
 echo (isset($_POST['php']) && $_POST['php']==0) ? ' selected' : '';
 echo '>None</option>';
-$default_version='7.2';
 foreach(PHP_VERSIONS as $version){
 	echo "<option value=\"$version\"";
-	echo (isset($_POST['php']) && $_POST['php']===$version || (!isset($_POST['php']) && $version===$default_version)) ? ' selected' : '';
+	echo (isset($_POST['php']) && $_POST['php']===$version || (!isset($_POST['php']) && $version===DEFAULT_PHP_VERSION)) ? ' selected' : '';
 	echo ">PHP $version</option>";
 }
 echo '</select></td></tr>';