diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 6a008fe76d2dbb..c02b773e8fd002 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -154,7 +154,7 @@ Writable.prototype.pipe = function() {
 };
 
 
-function writeAfterEnd(stream, state, cb) {
+function writeAfterEnd(stream, cb) {
   var er = new Error('write after end');
   // TODO: defer error events consistently everywhere, not just the cb
   stream.emit('error', er);
@@ -204,7 +204,7 @@ Writable.prototype.write = function(chunk, encoding, cb) {
     cb = nop;
 
   if (state.ended)
-    writeAfterEnd(this, state, cb);
+    writeAfterEnd(this, cb);
   else if (validChunk(this, state, chunk, cb)) {
     state.pendingcb++;
     ret = writeOrBuffer(this, state, chunk, encoding, cb);
@@ -329,7 +329,7 @@ function onwrite(stream, er) {
     onwriteError(stream, state, sync, er, cb);
   else {
     // Check if we're actually ready to finish, but don't emit yet
-    var finished = needFinish(stream, state);
+    var finished = needFinish(state);
 
     if (!finished &&
         !state.corked &&
@@ -453,7 +453,7 @@ Writable.prototype.end = function(chunk, encoding, cb) {
 };
 
 
-function needFinish(stream, state) {
+function needFinish(state) {
   return (state.ending &&
           state.length === 0 &&
           state.bufferedRequest === null &&
@@ -469,7 +469,7 @@ function prefinish(stream, state) {
 }
 
 function finishMaybe(stream, state) {
-  var need = needFinish(stream, state);
+  var need = needFinish(state);
   if (need) {
     if (state.pendingcb === 0) {
       prefinish(stream, state);
diff --git a/lib/util.js b/lib/util.js
index 69c46e6ea7a9fb..39f521fde98069 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -499,7 +499,7 @@ function reduceToSingleString(output, base, braces) {
 
 // NOTE: These type checking functions intentionally don't use `instanceof`
 // because it is fragile and can be easily faked with `Object.create()`.
-const isArray = exports.isArray = Array.isArray;
+exports.isArray = Array.isArray;
 
 function isBoolean(arg) {
   return typeof arg === 'boolean';