diff --git a/fxjs/gc/heap.cpp b/fxjs/gc/heap.cpp
--- a/fxjs/gc/heap.cpp
+++ b/fxjs/gc/heap.cpp
@@ -34,11 +34,12 @@ class CFXGC_Platform final : public cppgc::Platform {
     return g_platform->MonotonicallyIncreasingTime();
   }

-  std::shared_ptr<cppgc::TaskRunner> GetForegroundTaskRunner() override {
+  std::shared_ptr<cppgc::TaskRunner> GetForegroundTaskRunner(
+      cppgc::TaskPriority priority) override {
     // V8's default platform creates a new task runner when passed the
     // v8::Isolate pointer the first time. For non-default platforms this will
     // require getting the appropriate task runner.
-    return g_platform->GetForegroundTaskRunner(g_isolate);
+    return g_platform->GetForegroundTaskRunner(g_isolate, priority);
   }

   std::unique_ptr<cppgc::JobHandle> PostJob(