diff --git a/cpu/cortexm_common/thread_arch.c b/cpu/cortexm_common/thread_arch.c
index ebc13ac609..0b4352b658 100644
--- a/cpu/cortexm_common/thread_arch.c
+++ b/cpu/cortexm_common/thread_arch.c
@@ -474,4 +474,5 @@ void sched_arch_idle(void)
 #endif
     irq_restore(state);
     NVIC_SetPriority(PendSV_IRQn, CPU_CORTEXM_PENDSV_IRQ_PRIO);
+    SCB->ICSR = SCB_ICSR_PENDSVCLR_Msk;
 }