diff --git a/inc/entity.class.php b/inc/entity.class.php
index 33be55b..deab934 100644
--- a/inc/entity.class.php
+++ b/inc/entity.class.php
@@ -347,7 +347,7 @@ static function install(Migration $migration) {
 
       $table = self::getTable();
 
-      if (!$DB::tableExists($table)) {
+      if (!$DB->tableExists($table)) {
          $migration->displayMessage("Installing $table");
 
          $query = "CREATE TABLE IF NOT EXISTS `$table` (
diff --git a/inc/ticket.class.php b/inc/ticket.class.php
index b2eddfc..fd9fb62 100644
--- a/inc/ticket.class.php
+++ b/inc/ticket.class.php
@@ -536,7 +536,7 @@ static function install(Migration $migration) {
 
       $table = self::getTable();
 
-      if (!$DB::tableExists($table)) {
+      if (!$DB->tableExists($table)) {
          $migration->displayMessage("Installing $table");
 
          $query = "CREATE TABLE IF NOT EXISTS `$table` (
diff --git a/inc/type.class.php b/inc/type.class.php
index 31df8df..1fae9e1 100644
--- a/inc/type.class.php
+++ b/inc/type.class.php
@@ -50,7 +50,7 @@ static function install(Migration $migration) {
 
       $table = self::getTable();
 
-      if (!$DB::tableExists($table)) {
+      if (!$DB->tableExists($table)) {
          $migration->displayMessage("Installing $table");
 
          $query = "CREATE TABLE IF NOT EXISTS `$table` (