diff --git a/package.json b/package.json
index 0343d8584..41fe2bc5d 100644
--- a/package.json
+++ b/package.json
@@ -126,7 +126,7 @@
     "nyc": "^8.1.0",
     "rimraf": "^2.5.2",
     "sinon": "^1.14.1",
-    "standard": "^7.0.0"
+    "standard": "^8.1.0"
   },
   "scripts": {
     "build": "npm run build-indexes && gulp build --production",
diff --git a/src/xo-mixins/scheduling.js b/src/xo-mixins/scheduling.js
index 3891604ad..62094daaf 100644
--- a/src/xo-mixins/scheduling.js
+++ b/src/xo-mixins/scheduling.js
@@ -182,7 +182,7 @@ export default class {
     try {
       this._disable(id)
     } catch (exc) {
-      if (!exc instanceof SchedulerError) {
+      if (!(exc instanceof SchedulerError)) {
         throw exc
       }
     } finally {