diff --git a/drivers/timer/cortex_m_systick.c b/drivers/timer/cortex_m_systick.c
index 14c3a38b0b2..7f709500e99 100644
--- a/drivers/timer/cortex_m_systick.c
+++ b/drivers/timer/cortex_m_systick.c
@@ -772,6 +772,7 @@ return (u32_t) get_elapsed_count();
 #else
 		count = SysTick->LOAD - SysTick->VAL;
 #endif
+		__ISB();
 	} while (cac != clock_accumulated_count);
 
 	return cac + count;