diff --git a/include/imu/sensor/sensor_imu2d.h b/include/imu/sensor/sensor_imu2d.h
index 700d612ba2752ca3d115bd355658b7e30940ef73..880c9be07043a5f30da2df995e9e5d42ef8d9092 100644
--- a/include/imu/sensor/sensor_imu2d.h
+++ b/include/imu/sensor/sensor_imu2d.h
@@ -100,6 +100,7 @@ class SensorImu2d : public SensorBase
         double getAbInitialStdev() const;
         double getWbRateStdev() const;
         double getAbRateStdev() const;
+        bool   isGravityOrthogonal() const;
 
         ~SensorImu2d() override;
 
@@ -135,6 +136,11 @@ inline double SensorImu2d::getAbRateStdev() const
     return ab_rate_stdev;
 }
 
+inline bool SensorImu2d::isGravityOrthogonal() const
+{
+    return true;
+}
+
 } // namespace wolf
 
 #endif // SENSOR_Imu2D_H