diff --git a/core/dbengine.php b/core/dbengine.php
index 95ded663..375c8a98 100644
--- a/core/dbengine.php
+++ b/core/dbengine.php
@@ -77,8 +77,8 @@ class PostgreSQL extends DBEngine
     /** @var string */
     public $name = DatabaseDriver::PGSQL;
 
-    public $BOOL_Y = 'true';
-    public $BOOL_N = 'false';
+    public $BOOL_Y = true;
+    public $BOOL_N = false;
 
     public function init(PDO $db)
     {
@@ -94,8 +94,8 @@ class PostgreSQL extends DBEngine
     {
         $data = str_replace(SCORE::AIPK, "INTEGER NOT NULL PRIMARY KEY GENERATED ALWAYS AS IDENTITY", $data);
         $data = str_replace(SCORE::INET, "INET", $data);
-        $data = str_replace(SCORE::BOOL_Y, $this->BOOL_Y, $data);
-        $data = str_replace(SCORE::BOOL_N, $this->BOOL_N, $data);
+        $data = str_replace(SCORE::BOOL_Y, "true", $data);
+        $data = str_replace(SCORE::BOOL_N, "false", $data);
         $data = str_replace(SCORE::BOOL, "BOOL", $data);
         return $data;
     }