diff --git a/src/extensions/scratch3_microbit/index.js b/src/extensions/scratch3_microbit/index.js
index ce951c717..29b5d790a 100644
--- a/src/extensions/scratch3_microbit/index.js
+++ b/src/extensions/scratch3_microbit/index.js
@@ -239,7 +239,7 @@ class MicroBit {
      * Disconnect from the micro:bit.
      */
     disconnect () {
-        window.clearInterval(this._timeoutID);
+        window.clearTimeout(this._timeoutID);
         if (this._ble) {
             this._ble.disconnect();
         }
@@ -329,7 +329,7 @@ class MicroBit {
         this._sensors.gestureState = data[9];
 
         // cancel disconnect timeout and start a new one
-        window.clearInterval(this._timeoutID);
+        window.clearTimeout(this._timeoutID);
         this._timeoutID = window.setTimeout(
             () => this._ble.handleDisconnectError(BLEDataStoppedError),
             BLETimeout