diff --git a/resources/require.php b/resources/require.php
index 01cab5af15..95078cdf4e 100644
--- a/resources/require.php
+++ b/resources/require.php
@@ -35,12 +35,12 @@
 	$_SERVER["PROJECT_PATH"]  = $conf['project.path'];
 	if (isset($conf['project.path'])) {
 		$_SERVER["PROJECT_ROOT"] = $conf['document.root'].'/'.$conf['project.path'];
-		define("PROJECT_ROOT", $conf['document.root'].'/'.$conf['project.path']);
-		define("PROJECT_PATH", $conf['project.path']);
+		if (!defined('PROJECT_ROOT')) { define("PROJECT_ROOT", $conf['document.root'].'/'.$conf['project.path']); }
+		if (!defined('PROJECT_PATH')) { define("PROJECT_PATH", $conf['project.path']); }
 	}
 	else {
-		define("PROJECT_ROOT", $conf['document.root']);
-		define("PROJECT_PATH", '');
+		if (!defined('PROJECT_ROOT')) { define("PROJECT_ROOT", $conf['document.root']); }
+		if (!defined('PROJECT_PATH')) { define("PROJECT_PATH", ''); }
 	}
 
 //set the error reporting