diff --git a/lib/buffer.js b/lib/buffer.js
index 59a125960c276f..a8d07342e15eaa 100644
--- a/lib/buffer.js
+++ b/lib/buffer.js
@@ -85,6 +85,7 @@ const {
   normalizeEncoding,
   kIsEncodingSymbol,
   defineLazyProperties,
+  encodingsMap,
 } = require('internal/util');
 const {
   isAnyArrayBuffer,
@@ -95,7 +96,6 @@ const {
 const {
   inspect: utilInspect,
 } = require('internal/util/inspect');
-const { encodings } = internalBinding('string_decoder');
 
 const {
   codes: {
@@ -149,10 +149,6 @@ const constants = ObjectDefineProperties({}, {
 Buffer.poolSize = 8 * 1024;
 let poolSize, poolOffset, allocPool;
 
-const encodingsMap = { __proto__: null };
-for (let i = 0; i < encodings.length; ++i)
-  encodingsMap[encodings[i]] = i;
-
 function createPool() {
   poolSize = Buffer.poolSize;
   allocPool = createUnsafeBuffer(poolSize).buffer;
diff --git a/lib/internal/util.js b/lib/internal/util.js
index 0b261a82432609..fe1c56cff20a4c 100644
--- a/lib/internal/util.js
+++ b/lib/internal/util.js
@@ -65,6 +65,7 @@ const {
 } = internalBinding('util');
 const { isNativeError } = internalBinding('types');
 const { getOptionValue } = require('internal/options');
+const { encodings } = internalBinding('string_decoder');
 
 const noCrypto = !process.versions.openssl;
 
@@ -856,6 +857,10 @@ class WeakReference {
   }
 }
 
+const encodingsMap = { __proto__: null };
+for (let i = 0; i < encodings.length; ++i)
+  encodingsMap[encodings[i]] = i;
+
 module.exports = {
   getLazy,
   assertCrypto,
@@ -869,6 +874,7 @@ module.exports = {
   defineReplaceableLazyAttribute,
   deprecate,
   emitExperimentalWarning,
+  encodingsMap,
   exposeInterface,
   exposeLazyInterfaces,
   exposeNamespace,
diff --git a/lib/string_decoder.js b/lib/string_decoder.js
index 2ed2de60de6ee5..c0dbfe2b5e92a8 100644
--- a/lib/string_decoder.js
+++ b/lib/string_decoder.js
@@ -38,15 +38,18 @@ const {
   kSize,
   decode,
   flush,
-  encodings,
 } = internalBinding('string_decoder');
-const internalUtil = require('internal/util');
+const {
+  kIsEncodingSymbol,
+  encodingsMap,
+  normalizeEncoding: _normalizeEncoding,
+} = require('internal/util');
 const {
   ERR_INVALID_ARG_TYPE,
   ERR_INVALID_THIS,
   ERR_UNKNOWN_ENCODING,
 } = require('internal/errors').codes;
-const isEncoding = Buffer[internalUtil.kIsEncodingSymbol];
+const isEncoding = Buffer[kIsEncodingSymbol];
 
 const kNativeDecoder = Symbol('kNativeDecoder');
 
@@ -60,7 +63,7 @@ const kNativeDecoder = Symbol('kNativeDecoder');
  * @throws {TypeError} Throws an error when encoding is invalid
  */
 function normalizeEncoding(enc) {
-  const nenc = internalUtil.normalizeEncoding(enc);
+  const nenc = _normalizeEncoding(enc);
   if (nenc === undefined) {
     if (Buffer.isEncoding === isEncoding || !Buffer.isEncoding(enc))
       throw new ERR_UNKNOWN_ENCODING(enc);
@@ -69,10 +72,6 @@ function normalizeEncoding(enc) {
   return nenc;
 }
 
-const encodingsMap = {};
-for (let i = 0; i < encodings.length; ++i)
-  encodingsMap[encodings[i]] = i;
-
 /**
  * StringDecoder provides an interface for efficiently splitting a series of
  * buffers into a series of JS strings without breaking apart multi-byte