diff --git a/src/Preflight/Preflight.php b/src/Preflight/Preflight.php
index 726f2dea45..4c5514ecdf 100644
--- a/src/Preflight/Preflight.php
+++ b/src/Preflight/Preflight.php
@@ -268,7 +268,7 @@ public function preflight($argv)
         // a site-local Drush. If there is, we will redispatch to it.
         // NOTE: termination handlers have not been set yet, so it is okay
         // to exit early without taking special action.
-        $status = RedispatchToSiteLocal::redispatchIfSiteLocalDrush($argv, $root, $this->environment->vendorPath(), $this->logger())    ;
+        $status = RedispatchToSiteLocal::redispatchIfSiteLocalDrush($argv, realpath($root), $this->environment->vendorPath(), $this->logger())    ;
         if ($status !== false) {
             return $status;
         }