diff --git a/Userland/Libraries/LibCore/Promise.h b/Userland/Libraries/LibCore/Promise.h
index 90dc01eeba..9517f22074 100644
--- a/Userland/Libraries/LibCore/Promise.h
+++ b/Userland/Libraries/LibCore/Promise.h
@@ -63,6 +63,10 @@ public:
 
 private:
     Promise() = default;
+    Promise(Object* parent)
+        : Object(parent)
+    {
+    }
 
     Optional<ErrorOr<Result>> m_pending_or_error;
 };