diff --git a/src/MatrixHttpApi.php b/src/MatrixHttpApi.php
index d782164..d5af85e 100644
--- a/src/MatrixHttpApi.php
+++ b/src/MatrixHttpApi.php
@@ -652,7 +652,7 @@ class MatrixHttpApi {
     public function inviteUser(string $roomId, string $userId) {
         $body = ['user_id' => $userId];
 
-        return $this->send('POST', sprintf('.rooms/%s/invite', urlencode($roomId)), $body);
+        return $this->send('POST', sprintf('/rooms/%s/invite', urlencode($roomId)), $body);
     }
 
     /**