diff --git a/include/mango/sched.h b/include/mango/sched.h
index 0b3e78d..632c19e 100644
--- a/include/mango/sched.h
+++ b/include/mango/sched.h
@@ -10,6 +10,7 @@
 
 #define TASK_NAME_MAX       64
 #define PRIO_MAX            32
+#define PID_MAX             99999
 #define THREAD_KSTACK_ORDER VM_PAGE_4K
 #define THREAD_MAX          65536