diff --git a/src/drivers/distance_sensor/cm8jl65/CM8JL65.cpp b/src/drivers/distance_sensor/cm8jl65/CM8JL65.cpp
index 7e5894ed82..8887408ff3 100644
--- a/src/drivers/distance_sensor/cm8jl65/CM8JL65.cpp
+++ b/src/drivers/distance_sensor/cm8jl65/CM8JL65.cpp
@@ -100,7 +100,7 @@ CM8JL65::CM8JL65(const char *port, uint8_t rotation) :
 	device::Device::DeviceId device_id;
 	device_id.devid_s.bus_type = device::Device::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_port[sizeof(_port) - 2]);
+	uint8_t bus_num = atoi(&_port[strlen(_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		device_id.devid_s.bus = bus_num;
diff --git a/src/drivers/distance_sensor/leddar_one/LeddarOne.cpp b/src/drivers/distance_sensor/leddar_one/LeddarOne.cpp
index a46d4abeac..e57e6771e4 100644
--- a/src/drivers/distance_sensor/leddar_one/LeddarOne.cpp
+++ b/src/drivers/distance_sensor/leddar_one/LeddarOne.cpp
@@ -48,7 +48,7 @@ LeddarOne::LeddarOne(const char *serial_port, uint8_t device_orientation):
 	device::Device::DeviceId device_id;
 	device_id.devid_s.bus_type = device::Device::DeviceBusType::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_serial_port[sizeof(_serial_port) - 2]);
+	uint8_t bus_num = atoi(&_serial_port[strlen(_serial_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		device_id.devid_s.bus = bus_num;
diff --git a/src/drivers/distance_sensor/lightware_laser_serial/lightware_laser_serial.cpp b/src/drivers/distance_sensor/lightware_laser_serial/lightware_laser_serial.cpp
index e31bdd9964..34716cbc2e 100644
--- a/src/drivers/distance_sensor/lightware_laser_serial/lightware_laser_serial.cpp
+++ b/src/drivers/distance_sensor/lightware_laser_serial/lightware_laser_serial.cpp
@@ -54,7 +54,7 @@ LightwareLaserSerial::LightwareLaserSerial(const char *port, uint8_t rotation) :
 	device::Device::DeviceId device_id;
 	device_id.devid_s.bus_type = device::Device::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_port[sizeof(_port) - 2]);
+	uint8_t bus_num = atoi(&_port[strlen(_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		device_id.devid_s.bus = bus_num;
diff --git a/src/drivers/distance_sensor/pga460/pga460.cpp b/src/drivers/distance_sensor/pga460/pga460.cpp
index e479fc7d50..1765cde777 100644
--- a/src/drivers/distance_sensor/pga460/pga460.cpp
+++ b/src/drivers/distance_sensor/pga460/pga460.cpp
@@ -51,7 +51,7 @@ PGA460::PGA460(const char *port)
 	_device_id.devid_s.devtype = DRV_DIST_DEVTYPE_PGA460;
 	_device_id.devid_s.bus_type = device::Device::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_port[sizeof(_port) - 2]);
+	uint8_t bus_num = atoi(&_port[strlen(_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		_device_id.devid_s.bus = bus_num;
diff --git a/src/drivers/distance_sensor/tfmini/TFMINI.cpp b/src/drivers/distance_sensor/tfmini/TFMINI.cpp
index f4b3156245..d20a20b4c2 100644
--- a/src/drivers/distance_sensor/tfmini/TFMINI.cpp
+++ b/src/drivers/distance_sensor/tfmini/TFMINI.cpp
@@ -50,7 +50,7 @@ TFMINI::TFMINI(const char *port, uint8_t rotation) :
 	device_id.devid_s.devtype = DRV_DIST_DEVTYPE_TFMINI;
 	device_id.devid_s.bus_type = device::Device::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_port[sizeof(_port) - 2]);
+	uint8_t bus_num = atoi(&_port[strlen(_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		device_id.devid_s.bus = bus_num;
diff --git a/src/drivers/distance_sensor/ulanding_radar/AerotennaULanding.cpp b/src/drivers/distance_sensor/ulanding_radar/AerotennaULanding.cpp
index d959f71eb1..6558aef348 100644
--- a/src/drivers/distance_sensor/ulanding_radar/AerotennaULanding.cpp
+++ b/src/drivers/distance_sensor/ulanding_radar/AerotennaULanding.cpp
@@ -48,7 +48,7 @@ AerotennaULanding::AerotennaULanding(const char *port, uint8_t rotation) :
 	device::Device::DeviceId device_id;
 	device_id.devid_s.bus_type = device::Device::DeviceBusType_SERIAL;
 
-	uint8_t bus_num = atoi(&_port[sizeof(_port) - 2]);
+	uint8_t bus_num = atoi(&_port[strlen(_port) - 1]); // Assuming '/dev/ttySx'
 
 	if (bus_num < 10) {
 		device_id.devid_s.bus = bus_num;