diff --git a/js/data_storage.js b/js/data_storage.js
index dffb6a7b..cd8d28e1 100755
--- a/js/data_storage.js
+++ b/js/data_storage.js
@@ -93,6 +93,7 @@ var SENSOR_DATA = {
     accelerometer: [0, 0, 0],
     magnetometer:  [0, 0, 0],
     altitude:      0,
+    sonar:         0,
     kinematics:    [0.0, 0.0, 0.0],
     debug:         [0, 0, 0, 0]
 };
@@ -143,4 +144,4 @@ var MISC = {
     vbatmincellvoltage:     0,
     vbatmaxcellvoltage:     0,
     vbatwarningcellvoltage: 0
-};
\ No newline at end of file
+};