diff --git a/controller/WebController.php b/controller/WebController.php
index 254c821a0..f30429fa1 100644
--- a/controller/WebController.php
+++ b/controller/WebController.php
@@ -112,7 +112,9 @@ private function guessBaseHref()
     $script_name = filter_input(INPUT_SERVER, 'SCRIPT_NAME', FILTER_SANITIZE_STRING);
     $script_filename = filter_input(INPUT_SERVER, 'SCRIPT_FILENAME', FILTER_SANITIZE_STRING);
     $script_filename = realpath($script_filename); // resolve any symlinks (see #274)
+    $script_filename = str_replace("\\", "/", $script_filename); // fixing windows paths with \ (see #309)
     $base_dir  = __DIR__; // Absolute path to your installation, ex: /var/www/mywebsite
+    $base_dir = str_replace("\\", "/", $base_dir); // fixing windows paths with \ (see #309)
     $doc_root  = preg_replace("!{$script_name}$!", '', $script_filename); # ex: /var/www
     $base_url  = preg_replace("!^{$doc_root}!", '', $base_dir); # ex: '' or '/mywebsite'
     $base_url = str_replace('/controller','/',$base_url);