diff --git a/src/devices/technicmediumhubtiltsensor.ts b/src/devices/technicmediumhubtiltsensor.ts
index e7e6233..e9f64e2 100644
--- a/src/devices/technicmediumhubtiltsensor.ts
+++ b/src/devices/technicmediumhubtiltsensor.ts
@@ -34,6 +34,14 @@ export class TechnicMediumHubTiltSensor extends Device {
                 let z = -message.readInt16LE(4);
                 const y = message.readInt16LE(6);
                 const x = message.readInt16LE(8);
+
+                // workaround for calibration problem or bug in technicMediumHub firmware 1.1.00.0000
+                if(y === 90 || y === -90) {
+                    z = Math.sign(y)*(z + 180);
+                    if(z > 180) z -= 360;
+                    if(z < -180) z += 360;
+                }
+
                 this.notify("tilt", { x, y, z });
                 break;