diff --git a/services/sensorservice/RotationVectorSensor.cpp b/services/sensorservice/RotationVectorSensor.cpp
index eecf260..50cd6be 100644
--- a/services/sensorservice/RotationVectorSensor.cpp
+++ b/services/sensorservice/RotationVectorSensor.cpp
@@ -125,6 +125,7 @@
         outEvent->data[0] = qx;
         outEvent->data[1] = qy;
         outEvent->data[2] = qz;
+        outEvent->data[3] = qw;
         outEvent->sensor = '_rov';
         outEvent->type = SENSOR_TYPE_ROTATION_VECTOR;
         return true;