diff --git a/Eigen/src/ThreadPool/NonBlockingThreadPool.h b/Eigen/src/ThreadPool/NonBlockingThreadPool.h
index 65a222c74..5c18366c7 100644
--- a/Eigen/src/ThreadPool/NonBlockingThreadPool.h
+++ b/Eigen/src/ThreadPool/NonBlockingThreadPool.h
@@ -42,7 +42,11 @@ class ThreadPoolTempl : public Eigen::ThreadPoolInterface {
       : env_(env),
         num_threads_(num_threads),
         allow_spinning_(allow_spinning),
-        spin_count_(0),
+        spin_count_(
+            // TODO(dvyukov,rmlarsen): The time spent in NonEmptyQueueIndex() is proportional to num_threads_ and
+            // we assume that new work is scheduled at a constant rate, so we divide `kSpintCount` by number of
+            // threads and number of spinning threads. The constant was picked based on a fair dice roll, tune it.
+            allow_spinning && num_threads > 0 ? kSpinCount / kMaxSpinningThreads / num_threads : 0),
         thread_data_(num_threads),
         all_coprimes_(num_threads),
         waiters_(num_threads),
@@ -311,7 +315,7 @@ class ThreadPoolTempl : public Eigen::ThreadPoolInterface {
   Environment env_;
   const int num_threads_;
   const bool allow_spinning_;
-  int spin_count_;
+  const int spin_count_;
   MaxSizeVector<ThreadData> thread_data_;
   MaxSizeVector<MaxSizeVector<unsigned>> all_coprimes_;
   MaxSizeVector<EventCount::Waiter> waiters_;
@@ -346,12 +350,6 @@ class ThreadPoolTempl : public Eigen::ThreadPoolInterface {
     pt->pool = this;
     pt->rand = GlobalThreadIdHash();
     pt->thread_id = thread_id;
-    // TODO(dvyukov,rmlarsen): The time spent in NonEmptyQueueIndex() is
-    // proportional to num_threads_ and we assume that new work is scheduled
-    // at a constant rate, so we divide `kSpintCount` by number of threads
-    // and number of spinning threads. The constant was picked based on a
-    // fair dice roll, tune it.
-    spin_count_ = allow_spinning_ && num_threads_ > 0 ? kSpinCount / kMaxSpinningThreads / num_threads_ : 0;
     Task t;
     while (!cancelled_.load(std::memory_order_relaxed)) {
       MaybeGetTask(&t);