diff --git a/src/arch/esp8266/arch.cc b/src/arch/esp8266/arch.cc
index 3490ffe67e7d450fdcbec01721dee572bb608d80..34151d2c909af1b117fd88536c232869d873749e 100644
--- a/src/arch/esp8266/arch.cc
+++ b/src/arch/esp8266/arch.cc
@@ -57,7 +57,7 @@ void Arch::idle_loop(void)
 {
 }
 
-void ArcH::idle(void)
+void Arch::idle(void)
 {
 }