diff --git a/Components/SerialPort/SerialPort.hpp b/Components/SerialPort/SerialPort.hpp
index 29100e279..09c38fc7d 100644
--- a/Components/SerialPort/SerialPort.hpp
+++ b/Components/SerialPort/SerialPort.hpp
@@ -79,7 +79,7 @@ class Line {
 		std::vector<Event> events_;
 		int remaining_delays_ = 0;
 		int transmission_extra_ = 0;
-		bool level_ = false;
+		bool level_ = true;
 		int clock_rate_ = 0;
 
 		ReadDelegate *read_delegate_ = nullptr;