diff --git a/common/constants.php b/common/constants.php
index 48350a753..214c5bfa3 100644
--- a/common/constants.php
+++ b/common/constants.php
@@ -25,11 +25,11 @@ define('RX_BASEDIR', str_replace('\\', '/', dirname(__DIR__)) . '/');
  */
 if (isset($_SERVER['DOCUMENT_ROOT']) && !strncmp(RX_BASEDIR,  str_replace('\\', '/', $_SERVER['DOCUMENT_ROOT']), strlen($_SERVER['DOCUMENT_ROOT'])))
 {
-    define('RX_BASEURL', '/' . trim(substr(RX_BASEDIR, strlen($_SERVER['DOCUMENT_ROOT'])), '/') . '/');
+    define('RX_BASEURL', str_replace('//', '/', '/' . trim(substr(RX_BASEDIR, strlen($_SERVER['DOCUMENT_ROOT'])), '/') . '/'));
 }
 elseif (isset($_SERVER['PHP_SELF']) && ($len = strlen($_SERVER['PHP_SELF'])) && $len >= 10 && substr($_SERVER['PHP_SELF'], $len - 10) === '/index.php')
 {
-    define('RX_BASEURL', '/' . trim(str_replace('\\', '/', substr($_SERVER['PHP_SELF'], 0, $len - 10)), '/') . '/');
+    define('RX_BASEURL', str_replace('//', '/', '/' . trim(str_replace('\\', '/', substr($_SERVER['PHP_SELF'], 0, $len - 10)), '/') . '/'));
 }
 else
 {