diff --git a/src/extensions/scratch3_microbit/index.js b/src/extensions/scratch3_microbit/index.js
index 16c0a6c44..91ef65293 100644
--- a/src/extensions/scratch3_microbit/index.js
+++ b/src/extensions/scratch3_microbit/index.js
@@ -69,6 +69,7 @@ class MicroBit {
          * @private
          */
         this._runtime = runtime;
+        this._runtime.on('PROJECT_STOP_ALL', this.stopAll.bind(this));
 
         /**
          * The BluetoothLowEnergy connection socket for reading/writing peripheral data.