diff --git a/benchmark/http/_chunky_http_client.js b/benchmark/http/_chunky_http_client.js
index 158be5a0eb6424..bde4eed7444e6f 100644
--- a/benchmark/http/_chunky_http_client.js
+++ b/benchmark/http/_chunky_http_client.js
@@ -50,8 +50,6 @@ function main(conf) {
     }
   }
 
-  var success = 0;
-  var failure = 0;
   var min = 10;
   var size = 0;
   var mod = 317;
@@ -69,14 +67,12 @@ function main(conf) {
       if ((d.length === pattern.length && d === pattern) ||
           (d.length > pattern.length &&
            d.slice(0, pattern.length) === pattern)) {
-        success += 1;
         did = true;
       } else {
         pattern = 'HTTP/1.1 ';
         if ((d.length === pattern.length && d === pattern) ||
             (d.length > pattern.length &&
              d.slice(0, pattern.length) === pattern)) {
-          failure += 1;
           did = true;
         }
       }
diff --git a/benchmark/static_http_server.js b/benchmark/static_http_server.js
index 43c493675933e7..13067d7b3eb890 100644
--- a/benchmark/static_http_server.js
+++ b/benchmark/static_http_server.js
@@ -6,7 +6,6 @@ var port = 12346;
 var n = 700;
 var bytes = 1024 * 5;
 
-var requests = 0;
 var responses = 0;
 
 var body = 'C'.repeat(bytes);
@@ -37,6 +36,5 @@ server.listen(port, function() {
       });
     });
     req.id = i;
-    requests++;
   }
 });
diff --git a/test/parallel/test-event-emitter-remove-listeners.js b/test/parallel/test-event-emitter-remove-listeners.js
index cc6f9516b5e3f3..95b39f4555b903 100644
--- a/test/parallel/test-event-emitter-remove-listeners.js
+++ b/test/parallel/test-event-emitter-remove-listeners.js
@@ -3,16 +3,12 @@ var common = require('../common');
 var assert = require('assert');
 var events = require('events');
 
-var count = 0;
-
 function listener1() {
   console.log('listener1');
-  count++;
 }
 
 function listener2() {
   console.log('listener2');
-  count++;
 }
 
 function remove1() {
diff --git a/test/parallel/test-tls-session-cache.js b/test/parallel/test-tls-session-cache.js
index c2bebc39dd1934..4b4dbda4a6dca2 100644
--- a/test/parallel/test-tls-session-cache.js
+++ b/test/parallel/test-tls-session-cache.js
@@ -89,11 +89,7 @@ function doTest(testOptions, callback) {
     var client = spawn(common.opensslCli, args, {
       stdio: [ 0, 1, 'pipe' ]
     });
-    var err = '';
     client.stderr.setEncoding('utf8');
-    client.stderr.on('data', function(chunk) {
-      err += chunk;
-    });
     client.on('exit', function(code) {
       console.error('done');
       assert.equal(code, 0);
diff --git a/test/sequential/test-pump-file2tcp-noexist.js b/test/sequential/test-pump-file2tcp-noexist.js
index 66d1e1119ff6e2..4f708bf31ce803 100644
--- a/test/sequential/test-pump-file2tcp-noexist.js
+++ b/test/sequential/test-pump-file2tcp-noexist.js
@@ -26,9 +26,6 @@ var server = net.createServer(function(stream) {
 server.listen(common.PORT, function() {
   var conn = net.createConnection(common.PORT);
   conn.setEncoding('utf8');
-  conn.on('data', function(chunk) {
-    buffer += chunk;
-  });
 
   conn.on('end', function() {
     conn.end();
@@ -39,8 +36,6 @@ server.listen(common.PORT, function() {
   });
 });
 
-var buffer = '';
-
 process.on('exit', function() {
   assert.equal(true, got_error);
   assert.equal(true, conn_closed);