diff --git a/src/modules/syslink/syslink_main.cpp b/src/modules/syslink/syslink_main.cpp
index c286445ad2b8..4f859cbc9126 100644
--- a/src/modules/syslink/syslink_main.cpp
+++ b/src/modules/syslink/syslink_main.cpp
@@ -254,7 +254,8 @@ Syslink::open_serial(const char *dev)
 	tcgetattr(fd, &config);
 
 	// clear ONLCR flag (which appends a CR for every LF)
-	config.c_oflag &= ~ONLCR;
+	config.c_oflag &= 0;
+	config.c_lflag &= ~(ECHO | ECHONL | ICANON | IEXTEN | ISIG);
 
 	// Disable hardware flow control
 	config.c_cflag &= ~CRTSCTS;