diff --git a/kernels/thread-os/thread-os.c b/kernels/thread-os/thread-os.c
index 6787bfa..b8f9aa3 100644
--- a/kernels/thread-os/thread-os.c
+++ b/kernels/thread-os/thread-os.c
@@ -11,7 +11,7 @@ typedef union task {
     void      (*entry)(void *);
     Context    *context;
   };
-  uint8_t stack[8192];
+  uint8_t stack[4096 * 3];
 } Task;
 
 Task *currents[MAX_CPU];