diff --git a/src/TokenAuthentication/TokenSearch.php b/src/TokenAuthentication/TokenSearch.php
index d69120a..5f1817d 100644
--- a/src/TokenAuthentication/TokenSearch.php
+++ b/src/TokenAuthentication/TokenSearch.php
@@ -28,7 +28,7 @@ public function __invoke(Request $request)
         if (isset($this->options['header'])) {
             if ($request->hasHeader($this->options['header'])) {
                 $header = $request->getHeader($this->options['header'])[0];
-                if (preg_match($this->options['regexp'], $header, $matches)) {
+                if (preg_match($this->options['regex'], $header, $matches)) {
                     return $matches[1];
                 }
             }