diff --git a/3party/marl/include/marl/scheduler.h b/3party/marl/include/marl/scheduler.h
index 9e133f2..9450b26 100644
--- a/3party/marl/include/marl/scheduler.h
+++ b/3party/marl/include/marl/scheduler.h
@@ -54,7 +54,7 @@ class Scheduler {
   // Config holds scheduler configuration settings that can be passed to the
   // Scheduler constructor.
   struct Config {
-    static constexpr size_t DefaultFiberStackSize = 1024 * 1024;
+    static constexpr size_t DefaultFiberStackSize = 4 * 1024 * 1024;
 
     // Per-worker-thread settings.
     struct WorkerThread {
@@ -417,10 +417,11 @@ class Scheduler {
     // spinForWork().
     void waitForWork() REQUIRES(work.mutex);
 
-    // spinForWorkAndLock() attempts to steal work from another Worker, and keeps
-    // the thread awake for a short duration. This reduces overheads of
+    // spinForWorkAndLock() attempts to steal work from another Worker, and
+    // keeps the thread awake for a short duration. This reduces overheads of
     // frequently putting the thread to sleep and re-waking. It locks the mutex
-    // before returning so that a stolen task cannot be re-stolen by other workers.
+    // before returning so that a stolen task cannot be re-stolen by other
+    // workers.
     void spinForWorkAndLock() ACQUIRE(work.mutex);
 
     // enqueueFiberTimeouts() enqueues all the fibers that have finished