diff --git a/src/sched.c b/src/sched.c
index 6b9ec16f..450bc2c8 100644
--- a/src/sched.c
+++ b/src/sched.c
@@ -234,7 +234,7 @@ run_shutdown(void)
 
 // Shutdown the machine if not already in the process of shutting down
 void
-sched_try_shutdown(uint16_t reason)
+sched_try_shutdown(unsigned int reason)
 {
     if (shutdown_status != 2)
         sched_shutdown(reason);
@@ -244,7 +244,7 @@ static jmp_buf shutdown_jmp;
 
 // Force the machine to immediately run the shutdown handlers
 void
-sched_shutdown(uint16_t reason)
+sched_shutdown(unsigned int reason)
 {
     irq_disable();
     shutdown_reason = reason;
diff --git a/src/sched.h b/src/sched.h
index aabb17b0..bdef5e4c 100644
--- a/src/sched.h
+++ b/src/sched.h
@@ -32,8 +32,8 @@ void sched_timer_kick(void);
 uint8_t sched_is_shutdown(void);
 uint16_t sched_shutdown_reason(void);
 void sched_clear_shutdown(void);
-void sched_try_shutdown(uint16_t reason);
-void sched_shutdown(uint16_t reason) __noreturn;
+void sched_try_shutdown(unsigned int reason);
+void sched_shutdown(unsigned int reason) __noreturn;
 void sched_main(void);
 
 // Compiler glue for DECL_X macros above.