diff --git a/hardware.hpp b/hardware.hpp
index e61dd6f..c359fb8 100644
--- a/hardware.hpp
+++ b/hardware.hpp
@@ -256,7 +256,7 @@ class BlockingHardware {
 		return HardwareImpl::rxByteBlocking(byte);
 	}
 
-	static bool peek([[maybe_unused]] data_t &byte) FORCE_INLINE
+	static bool peek(data_t &) FORCE_INLINE
 	{
 		static_assert(util::always_false_v<data_t>, "Peek with data is not supported in blocking mode");
 		return false;