diff --git a/src/thread.c b/src/thread.c
index 627b7e898ea2638b2f4e52b56b0d0899abb331be..c2a3e2e7978d851768ec43aa3c1838fb542360fc 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -598,7 +598,7 @@ rt_err_t rt_thread_delay_until(rt_tick_t *tick, rt_tick_t inc_tick)
     level = rt_hw_interrupt_disable();
 
     cur_tick = rt_tick_get();
-    if ((rt_int32_t)(cur_tick - *tick) < (rt_int32_t)inc_tick)
+    if (cur_tick - *tick < inc_tick)
     {
         rt_tick_t left_tick;