diff --git a/src/zc.php b/src/zc.php
index 50cc585..c3605dc 100644
--- a/src/zc.php
+++ b/src/zc.php
@@ -168,7 +168,7 @@ public function setTitle($title) {
     }
     public function setSubtitle($subtitle) {
         $this->setConfig('subtitle.text', $subtitle);
-        if (!array_key_exists('subtitle', $this->config['adjust-layout'])) {
+        if (!array_key_exists('adjust-layout', $this->config['subtitle'])) {
             $this->setConfig('subtitle.adjust-layout', true);
         }
     }