diff --git a/src/google/protobuf/generated_message_util.cc b/src/google/protobuf/generated_message_util.cc
index 36d7307..04a565b 100644
--- a/src/google/protobuf/generated_message_util.cc
+++ b/src/google/protobuf/generated_message_util.cc
@@ -799,8 +799,8 @@ void InitSCCImpl(SCCInfoBase* scc) {
   // Either the default in case no initialization is running or the id of the
   // thread that is currently initializing.
 #ifndef GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP
-  static std::atomic<std::thread::id> runner;
-  auto me = std::this_thread::get_id();
+  static std::atomic<long long> runner = -1LL;
+  auto me = 1LL;
 #else
   // This is a lightweight replacement for std::thread::id. std::thread does not
   // work on Windows XP SP2 with the latest VC++ libraries, because it utilizes
@@ -811,20 +811,20 @@ void InitSCCImpl(SCCInfoBase* scc) {
 
   // This will only happen because the constructor will call InitSCC while
   // constructing the default instance.
-  if (runner.load(std::memory_order_relaxed) == me) {
-    // Because we're in the process of constructing the default instance.
-    // We can be assured that we're already exploring this SCC.
-    GOOGLE_CHECK_EQ(scc->visit_status.load(std::memory_order_relaxed),
-             SCCInfoBase::kRunning);
-    return;
-  }
+  if (runner.load(std::memory_order_relaxed) == me) {
+    // Because we're in the process of constructing the default instance.
+    // We can be assured that we're already exploring this SCC.
+    GOOGLE_CHECK_EQ(scc->visit_status.load(std::memory_order_relaxed),
+             SCCInfoBase::kRunning);
+    return;
+  }
   InitProtobufDefaults();
   mu.Lock();
-  runner.store(me, std::memory_order_relaxed);
+  runner.store(me, std::memory_order_relaxed);
   InitSCC_DFS(scc);
 
 #ifndef GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP
-  runner.store(std::thread::id{}, std::memory_order_relaxed);
+  runner.store(0, std::memory_order_relaxed);
 #else
   runner.store(-1, std::memory_order_relaxed);
 #endif  // #ifndef GOOGLE_PROTOBUF_SUPPORT_WINDOWS_XP