diff --git a/wp-settings.php b/wp-settings.php
index ae551eab1..1480288e0 100644
--- a/wp-settings.php
+++ b/wp-settings.php
@@ -69,10 +69,12 @@ if ( empty( $_SERVER['REQUEST_URI'] ) ) {
 	else
 	{
 		// Some IIS + PHP configurations puts the script-name in the path-info (No need to append it twice)
-		if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
-			$_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
-		else
-			$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
+		if ( isset($_SERVER['PATH_INFO']) ) {
+			if ( $_SERVER['PATH_INFO'] == $_SERVER['SCRIPT_NAME'] )
+				$_SERVER['REQUEST_URI'] = $_SERVER['PATH_INFO'];
+			else
+				$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'] . $_SERVER['PATH_INFO'];
+		}
 
 		// Append the query string if it exists and isn't null
 		if (isset($_SERVER['QUERY_STRING']) && !empty($_SERVER['QUERY_STRING'])) {