diff --git a/MatrixPlugin.php b/MatrixPlugin.php
index 772e3ff6e28f6096a03370fddfa4ea932a7cd003..0d2f50312176f35f46c42c46c17407ea203ae64f 100644
--- a/MatrixPlugin.php
+++ b/MatrixPlugin.php
@@ -140,7 +140,7 @@ class MatrixPlugin extends StudIPPlugin implements StandardPlugin
             MatrixClient::get()->inviteIntoRoom(
                 MatrixAccount::requireSystemAccount(),
                 $room->getLinkedRoom(),
-                $matrix->matrix_user_id
+                $matrix->matrix_account_id
             );
         }
     }