diff --git a/src/Utils/ConfigurationManager.php b/src/Utils/ConfigurationManager.php
index d8c0e75..da7f775 100644
--- a/src/Utils/ConfigurationManager.php
+++ b/src/Utils/ConfigurationManager.php
@@ -154,10 +154,7 @@ private function getSitesDirectories()
     {
         $sitesDirectories = array_map(
             function ($directory) {
-                return sprintf(
-                    '%s/sites',
-                    $directory
-                );
+                return $directory . 'sites';
             },
             $this->getConfigurationDirectories()
         );
@@ -169,6 +166,8 @@ function ($directory) {
             }
         );
 
+        $sitesDirectories = array_unique($sitesDirectories);
+
         return $sitesDirectories;
     }