1 files changed, 2 insertions, 1 deletions
diff --git a/lib/string_decoder.js b/lib/string_decoder.js
index eee9a7d927..f0bca57050 100644
--- a/lib/string_decoder.js
+++ b/lib/string_decoder.js
@@ -23,6 +23,7 @@
 
 const Buffer = require('buffer').Buffer;
 const internalUtil = require('internal/util');
+const errors = require('internal/errors');
 const isEncoding = Buffer[internalUtil.kIsEncodingSymbol];
 
 // Do not cache `Buffer.isEncoding` when checking encoding names as some
@@ -31,7 +32,7 @@ function normalizeEncoding(enc) {
   const nenc = internalUtil.normalizeEncoding(enc);
   if (typeof nenc !== 'string' &&
       (Buffer.isEncoding === isEncoding || !Buffer.isEncoding(enc)))
-    throw new Error(`Unknown encoding: ${enc}`);
+    throw new errors.TypeError('ERR_UNKNOWN_ENCODING', enc);
   return nenc || enc;
 }