diff --git a/test/unit/debounce.html b/test/unit/debounce.html
index e27bc8b42f..9f528b6ac6 100644
--- a/test/unit/debounce.html
+++ b/test/unit/debounce.html
@@ -215,7 +215,6 @@
 
     const testEnqueue = (shouldFlush, done) => {
       const actualOrder = [];
-      let i=1;
       const enqueue = (type, {db, cb} = {}) => {
         cb = cb || (() => actualOrder.push(cb));
         db = Debouncer.debounce(db, type, cb);