diff --git a/builtins/web/timers.cpp b/builtins/web/timers.cpp
index 340c852..1923d1e 100644
--- a/builtins/web/timers.cpp
+++ b/builtins/web/timers.cpp
@@ -68,6 +68,10 @@ class TimerTask final : public api::AsyncTask {
     return true;
   }
 
+  [[nodiscard]] uint64_t deadline() override {
+    return deadline_;
+  }
+
   void trace(JSTracer *trc) override {
     TraceEdge(trc, &callback_, "Timer callback");
     for (auto &arg : arguments_) {
diff --git a/include/extension-api.h b/include/extension-api.h
index f6558b4..98a4783 100644
--- a/include/extension-api.h
+++ b/include/extension-api.h
@@ -127,6 +127,10 @@ class AsyncTask {
     return handle_;
   }
 
+  [[nodiscard]] virtual uint64_t deadline() {
+    return 0;
+  }
+
   virtual void trace(JSTracer *trc) = 0;
 
   /**