diff --git a/include/tools.php b/include/tools.php
index 07da051..d8a2bfe 100644
--- a/include/tools.php
+++ b/include/tools.php
@@ -55,7 +55,7 @@ function createConfigLines() {
 } 
 
 function checkSetup() {
-	if (null == DISTRIBUTION) {
+	if (defined(DISTRIBUTION)) {
 ?>
 <div class="alert alert-danger" role="alert">You are using an old config.php. Please configure your Dashboard by calling <a href="setup.php">setup.php</a>!</div>
 <?php