diff --git a/lib/virtual.js b/lib/virtual.js
index 201e4cd3..e9d75541 100644
--- a/lib/virtual.js
+++ b/lib/virtual.js
@@ -6,12 +6,12 @@ const path = require('path');
 let inode = 45000000;
 
 function createWebpackData(result) {
-	return (function(backendOrStorage) {
+	return (function(storage) {
 		// In Webpack v5, this variable is a "Backend", and has the data stored in a field
 		// _data. In V4, the `_` prefix isn't present.
-		if (backendOrStorage._data) {
-			const curLevelIdx = backendOrStorage._currentLevel;
-			const curLevel = backendOrStorage._levels[curLevelIdx];
+		if (storage._data) {
+			const curLevelIdx = storage._currentLevel;
+			const curLevel = storage._levels[curLevelIdx];
 			return {
 				result: this.result,
 				level: curLevel
@@ -173,7 +173,7 @@ function getData(storage, key) {
 
 function setData(storage, key, valueFactory) {
 	const storageData = getStorageData(storage);
-	const value = valueFactory(backendOrStorage);
+	const value = valueFactory(storage);
 
 	if (storageData instanceof Map) {
 		storageData.set(key, value);