diff --git a/arm/async.h b/arm/async.h
index 27877ad..2ae5672 100644
--- a/arm/async.h
+++ b/arm/async.h
@@ -1,3 +1,4 @@
+#pragma once
 
 #include <coroutine>
 #include <chrono>
diff --git a/arm/main.cc b/arm/main.cc
index 5c23183..f7915a8 100644
--- a/arm/main.cc
+++ b/arm/main.cc
@@ -49,7 +49,7 @@ async::task<> echo() {
         uint8_t c = co_await reader;
         ClearLed(1);
         ToggleLed(2);
-        co_await feeder.feed(std::as_bytes(std::span{&c, 1}));
+        feeder.feed(std::as_bytes(std::span{&c, 1}));
     }
 }
 #else