diff --git a/lib/BannerPlugin.js b/lib/BannerPlugin.js
index 04c50150f..c8d6c8ea0 100644
--- a/lib/BannerPlugin.js
+++ b/lib/BannerPlugin.js
@@ -46,14 +46,16 @@ const getReplacer = (value, allowEmpty) => {
 
 
 const interpolate = (banner, file, hash, chunkHash) => {
-	const [name, ext] = file.split(".");
+	const parts = file.split(".");
+	const name = parts[0];
+	const ext = parts[1];
 
 	return banner
 		.replace(REGEXP_HASH, withHashLength(getReplacer(hash)))
 		.replace(REGEXP_CHUNKHASH, withHashLength(getReplacer(chunkHash)))
 		.replace(REGEXP_NAME, name)
 		.replace(REGEXP_EXT, ext);
-}
+};
 
 class BannerPlugin {
 	constructor(options) {