diff --git a/src/extensions/scratch3_boost/index.js b/src/extensions/scratch3_boost/index.js
index acaedd56d..6d4b4080f 100644
--- a/src/extensions/scratch3_boost/index.js
+++ b/src/extensions/scratch3_boost/index.js
@@ -471,7 +471,7 @@ class BoostMotor {
      * @param {number} direction - rotate in this direction
      */
     turnOnForDegrees (degrees, direction) {
-        if (this._power === 0) {
+        if (this.power === 0) {
             this.pendingPromiseFunction();
             return;
         }