diff --git a/src/modules/commander/accelerometer_calibration.c b/src/modules/commander/accelerometer_calibration.c
index dc653a079d..6a304896a3 100644
--- a/src/modules/commander/accelerometer_calibration.c
+++ b/src/modules/commander/accelerometer_calibration.c
@@ -268,8 +268,8 @@ int detect_orientation(int mavlink_fd, int sub_sensor_combined) {
 	float accel_disp[3] = { 0.0f, 0.0f, 0.0f };
 	/* EMA time constant in seconds*/
 	float ema_len = 0.2f;
-	/* set "still" threshold to 0.1 m/s^2 */
-	float still_thr2 = pow(0.1f, 2);
+	/* set "still" threshold to 0.25 m/s^2 */
+	float still_thr2 = pow(0.25f, 2);
 	/* set accel error threshold to 5m/s^2 */
 	float accel_err_thr = 5.0f;
 	/* still time required in us */
diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index b2a6c6a790..5722d2fdf7 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -391,7 +391,7 @@ namespace sensors
 #endif
 static const int ERROR = -1;
 
-Sensors	*g_sensors;
+Sensors	*g_sensors = nullptr;
 }
 
 Sensors::Sensors() :