diff --git a/config/build.yml b/config/build.yml
index 0379c6ca7..efa3bd5ed 100644
--- a/config/build.yml
+++ b/config/build.yml
@@ -80,7 +80,6 @@ drupal:
 drush:
   bin: ${composer.bin}/drush
   dir: ${docroot}
-  uri: default
   assume: yes
   passthru: yes
   logoutput: yes
diff --git a/src/Robo/Hooks/InitHook.php b/src/Robo/Hooks/InitHook.php
index db8668dbf..e15d42ccd 100644
--- a/src/Robo/Hooks/InitHook.php
+++ b/src/Robo/Hooks/InitHook.php
@@ -29,7 +29,9 @@ public function initialize() {
     // We set the value for site late in the bootstrap process so that a user
     // may define its value at runtime via --define. This can only happen after
     // input has been processed.
-    $site = $this->getConfigValue('site', 'default');
+    $multisites = $this->getConfigValue('multisites');
+    $first_multisite = reset($multisites);
+    $site = $this->getConfigValue('site', $first_multisite);
     $this->getConfig()->setSiteConfig($site);
   }