diff --git a/test/fuzzer/wasm.cc b/test/fuzzer/wasm.cc
index fb9135b0f1..8815762826 100644
--- a/test/fuzzer/wasm.cc
+++ b/test/fuzzer/wasm.cc
@@ -55,5 +55,9 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   if (compiles) {
     i::wasm::fuzzer::InterpretAndExecuteModule(i_isolate, module_object);
   }
+
+  // Pump the message loop and run micro tasks, e.g. GC finalization tasks.
+  support->PumpMessageLoop(v8::platform::MessageLoopBehavior::kDoNotWait);
+  isolate->RunMicrotasks();
   return 0;
 }