diff --git a/common.php b/common.php
index 2d875939..c0fac2ff 100644
--- a/common.php
+++ b/common.php
@@ -95,17 +95,23 @@ for($i = 1; $i < $size; $i++)
 $basedir = str_replace(array('/admin', '/install'), '', $basedir);
 define('BASE_DIR', $basedir);
 
-if(isset($_SERVER['HTTP_HOST'])) {
-	if (isset($_SERVER['HTTPS'][0]) && $_SERVER['HTTPS'] === 'on')
-		define('SERVER_URL', 'https://' . $_SERVER['HTTP_HOST']);
-	else
-		define('SERVER_URL', 'http://' . $_SERVER['HTTP_HOST']);
-
-	define('BASE_URL', SERVER_URL . BASE_DIR . '/');
-	define('ADMIN_URL', SERVER_URL . BASE_DIR . '/admin/');
-
-	//define('CURRENT_URL', BASE_URL . $_SERVER['REQUEST_URI']);
+if(isset($_SERVER['HTTP_HOST'][0])) {
+	$baseHost = $_SERVER['HTTP_HOST'];
 }
+else {
+	if(isset($_SERVER['SERVER_NAME'][0])) {
+		$baseHost = $_SERVER['SERVER_NAME'];
+	}
+	else {
+		$baseHost = $_SERVER['SERVER_ADDR'];
+	}
+}
+
+define('SERVER_URL', 'http' . (isset($_SERVER['HTTPS'][0]) && strtolower($_SERVER['HTTPS']) === 'on' ? 's' : '') . '://' . $baseHost);
+define('BASE_URL', SERVER_URL . BASE_DIR . '/');
+define('ADMIN_URL', SERVER_URL . BASE_DIR . '/admin/');
+
+//define('CURRENT_URL', BASE_URL . $_SERVER['REQUEST_URI']);
 
 require SYSTEM . 'exception.php';
 require SYSTEM . 'autoload.php';