diff --git a/src/runtime/runtime_atsamd21.go b/src/runtime/runtime_atsamd21.go
index 1d84a4a9..353ab488 100644
--- a/src/runtime/runtime_atsamd21.go
+++ b/src/runtime/runtime_atsamd21.go
@@ -308,7 +308,7 @@ func timerSleep(ticks uint32) bool {
 	sam.RTC_MODE0.INTENSET.SetBits(sam.RTC_MODE0_INTENSET_CMP0)
 
 wait:
-	arm.Asm("wfe")
+	waitForEvents()
 	if timerWakeup.Get() != 0 {
 		return true
 	}
diff --git a/src/runtime/runtime_atsamd51.go b/src/runtime/runtime_atsamd51.go
index 0a581430..201e2df0 100644
--- a/src/runtime/runtime_atsamd51.go
+++ b/src/runtime/runtime_atsamd51.go
@@ -292,7 +292,7 @@ func timerSleep(ticks uint32) bool {
 	sam.RTC_MODE0.INTENSET.SetBits(sam.RTC_MODE0_INTENSET_CMP0)
 
 wait:
-	arm.Asm("wfe")
+	waitForEvents()
 	if timerWakeup.Get() != 0 {
 		return true
 	}
diff --git a/src/runtime/runtime_nrf.go b/src/runtime/runtime_nrf.go
index 9a0678c6..20f81f1a 100644
--- a/src/runtime/runtime_nrf.go
+++ b/src/runtime/runtime_nrf.go
@@ -3,7 +3,6 @@
 package runtime
 
 import (
-	"device/arm"
 	"device/nrf"
 	"machine"
 	"runtime/interrupt"
@@ -114,6 +113,6 @@ func rtc_sleep(ticks uint32) {
 	}
 	nrf.RTC1.CC[0].Set((nrf.RTC1.COUNTER.Get() + ticks) & 0x00ffffff)
 	for rtc_wakeup.Get() == 0 {
-		arm.Asm("wfi")
+		waitForEvents()
 	}
 }