diff --git a/src/node_worker.h b/src/node_worker.h
index adc755426d03c8..43b92ed40ed8bb 100644
--- a/src/node_worker.h
+++ b/src/node_worker.h
@@ -70,7 +70,7 @@ class Worker : public AsyncWrap {
   bool thread_joined_ = true;
   int exit_code_ = 0;
   uint64_t thread_id_ = -1;
-  uintptr_t stack_base_;
+  uintptr_t stack_base_ = 0;
 
   // Full size of the thread's stack.
   static constexpr size_t kStackSize = 4 * 1024 * 1024;