diff --git a/src/drivers/distance_sensor/lightware_grf_serial/lightware_grf_serial.cpp b/src/drivers/distance_sensor/lightware_grf_serial/lightware_grf_serial.cpp
index 403c61f562..82cabca08c 100755
--- a/src/drivers/distance_sensor/lightware_grf_serial/lightware_grf_serial.cpp
+++ b/src/drivers/distance_sensor/lightware_grf_serial/lightware_grf_serial.cpp
@@ -256,8 +256,8 @@ void GRFLaserSerial::Run()
 		/* clear ONLCR flag (which appends a CR for every LF) */
 		uart_config.c_oflag &= ~ONLCR;
 
-		/* no parity, one stop bit */
-		uart_config.c_cflag &= ~(CSTOPB | PARENB);
+		/* no parity, one stop bit, no hardware flow control */
+		uart_config.c_cflag &= ~(CSTOPB | PARENB | CRTSCTS);
 
 		unsigned speed = B115200;
 
diff --git a/src/drivers/distance_sensor/lightware_sf45_serial/lightware_sf45_serial.cpp b/src/drivers/distance_sensor/lightware_sf45_serial/lightware_sf45_serial.cpp
index e15c43a44e..561d2bc555 100755
--- a/src/drivers/distance_sensor/lightware_sf45_serial/lightware_sf45_serial.cpp
+++ b/src/drivers/distance_sensor/lightware_sf45_serial/lightware_sf45_serial.cpp
@@ -253,7 +253,7 @@ void SF45LaserSerial::Run()
 		uart_config.c_oflag &= ~ONLCR;
 
 		/* no parity, one stop bit */
-		uart_config.c_cflag &= ~(CSTOPB | PARENB);
+		uart_config.c_cflag &= ~(CSTOPB | PARENB | CRTSCTS);
 
 		unsigned speed = B921600;