diff --git a/libraries/AP_InertialSensor/AP_InertialSensor_PX4.cpp b/libraries/AP_InertialSensor/AP_InertialSensor_PX4.cpp
index bc8a5232f2..c107c5f80a 100644
--- a/libraries/AP_InertialSensor/AP_InertialSensor_PX4.cpp
+++ b/libraries/AP_InertialSensor/AP_InertialSensor_PX4.cpp
@@ -43,12 +43,12 @@ AP_InertialSensor_Backend *AP_InertialSensor_PX4::detect(AP_InertialSensor &_imu
 bool AP_InertialSensor_PX4::_init_sensor(void) 
 {
     // assumes max 3 instances
-    _accel_fd[0] = open(ACCEL_DEVICE_PATH, O_RDONLY);
-    _accel_fd[1] = open(ACCEL_DEVICE_PATH "1", O_RDONLY);
-    _accel_fd[2] = open(ACCEL_DEVICE_PATH "2", O_RDONLY);
-    _gyro_fd[0] = open(GYRO_DEVICE_PATH, O_RDONLY);
-    _gyro_fd[1] = open(GYRO_DEVICE_PATH "1", O_RDONLY);
-    _gyro_fd[2] = open(GYRO_DEVICE_PATH "2", O_RDONLY);
+    _accel_fd[0] = open(ACCEL_BASE_DEVICE_PATH "0", O_RDONLY);
+    _accel_fd[1] = open(ACCEL_BASE_DEVICE_PATH "1", O_RDONLY);
+    _accel_fd[2] = open(ACCEL_BASE_DEVICE_PATH "2", O_RDONLY);
+    _gyro_fd[0] = open(GYRO_BASE_DEVICE_PATH "0", O_RDONLY);
+    _gyro_fd[1] = open(GYRO_BASE_DEVICE_PATH "1", O_RDONLY);
+    _gyro_fd[2] = open(GYRO_BASE_DEVICE_PATH "2", O_RDONLY);
 
     _num_accel_instances = 0;
     _num_gyro_instances = 0;