diff --git a/types/webpack-node-externals/index.d.ts b/types/webpack-node-externals/index.d.ts
index e1a4078c26..80dc73b27b 100644
--- a/types/webpack-node-externals/index.d.ts
+++ b/types/webpack-node-externals/index.d.ts
@@ -22,7 +22,7 @@ declare namespace webpackNodeExternals {
          * they should be bundled.
          * @default []
          */
-        whitelist?: WhitelistOption[];
+        whitelist?: WhitelistOption[] | WhitelistOption;
         /**
          * @default ['.bin']
          */