diff --git a/src/Models/Model_Property.php b/src/Models/Model_Property.php
index 06da4df8..c59f44d5 100644
--- a/src/Models/Model_Property.php
+++ b/src/Models/Model_Property.php
@@ -4,6 +4,7 @@ class Model_Property extends RedBean_SimpleModel
 	const FeaturedPostId = 0;
 	const FeaturedPostUserName = 1;
 	const FeaturedPostDate = 2;
+	const DbVersion = 'db-version';
 
 	static $allProperties = null;
 
diff --git a/upgrade.php b/upgrade.php
index 4a1f0f71..c3700db3 100644
--- a/upgrade.php
+++ b/upgrade.php
@@ -2,7 +2,7 @@
 require_once 'src/core.php';
 $config = \Chibi\Registry::getConfig();
 
-$dbVersion = Model_Property::get('db-version');
+$dbVersion = Model_Property::get(Model_Property::DbVersion);
 printf('DB version = %d' . PHP_EOL, $dbVersion);
 
 $upgrades = glob('src/Upgrades/*.sql');
@@ -28,5 +28,5 @@ foreach ($upgrades as $upgradePath)
 		}
 	}
 
-	Model_Property::set('db-version', $upgradeVersion);
+	Model_Property::set(Model_Property::DbVersion, $upgradeVersion);
 }