diff --git a/copy-to.js b/copy-to.js
index ad66b45..5947bdd 100644
--- a/copy-to.js
+++ b/copy-to.js
@@ -1,3 +1,5 @@
+'use strict';
+
 module.exports = function(txt, options) {
   return new CopyStreamQuery(txt, options)
 }
@@ -77,7 +79,7 @@ CopyStreamQuery.prototype._transform = function(chunk, enc, cb) {
       case code.NoticeResponse:
       case code.NotificationResponse:
         break;
-  
+
       case code.ErrorResponse:
       case code.CopyDone:
         this.pushBufferIfneeded();
diff --git a/index.js b/index.js
index ccac224..c1b23f1 100644
--- a/index.js
+++ b/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var CopyToQueryStream = require('./copy-to')
 module.exports = {
   to: function(txt, options) {
diff --git a/test/binary.js b/test/binary.js
index a20366e..700c11d 100644
--- a/test/binary.js
+++ b/test/binary.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var assert = require('assert')
 var gonna = require('gonna')
 
@@ -19,7 +21,7 @@ var testBinaryCopy = function() {
   var fromClient = client()
   var toClient = client()
 
-  queries = [
+  var queries = [
     'DROP TABLE IF EXISTS data',
     'CREATE TABLE IF NOT EXISTS data (num BIGINT, word TEXT)',
     'INSERT INTO data (num, word) VALUES (1, \'hello\'), (2, \'other thing\'), (3, \'goodbye\')',
@@ -33,7 +35,7 @@ var testBinaryCopy = function() {
     var fromStream = fromClient.query(to('COPY (SELECT * FROM data) TO STDOUT BINARY'))
     var toStream = toClient.query(from('COPY data_copy FROM STDIN BINARY'))
 
-    runStream = function(callback) {
+    var runStream = function(callback) {
       fromStream.on('error', callback)
       toStream.on('error', callback)
       toStream.on('finish', callback)
diff --git a/test/copy-from.js b/test/copy-from.js
index 1765ca5..ee98a11 100644
--- a/test/copy-from.js
+++ b/test/copy-from.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var assert = require('assert')
 var gonna = require('gonna')
 
@@ -68,6 +70,6 @@ var testSingleEnd = function() {
     if (count == 1) fromClient.end();
   })
   stream.end(Buffer('1\n'))
-    
+
 }
 testSingleEnd()
diff --git a/test/copy-to.js b/test/copy-to.js
index 50bd7c8..9e88e71 100644
--- a/test/copy-to.js
+++ b/test/copy-to.js
@@ -1,3 +1,5 @@
+'use strict';
+
 var assert = require('assert')
 var gonna = require('gonna')
 
@@ -29,7 +31,7 @@ var testComparators = function() {
     assert(copy1._gotCopyOutResponse, 'should have received CopyOutResponse')
     assert(!copy1._remainder, 'Message with no additional data (len=Int4Len+0) should not leave a remainder')
   }))
-  copy1.end(new Buffer([code.CopyOutResponse, 0x00, 0x00, 0x00, 0x04])); 
+  copy1.end(new Buffer([code.CopyOutResponse, 0x00, 0x00, 0x00, 0x04]));
 
 
 }
@@ -104,8 +106,8 @@ var testNoticeResponse = function() {
       stream.on('data', function(data) {
       })
       stream.on('error', callback)
-     
-      // make sure stream is pulled from 
+
+      // make sure stream is pulled from
       stream.pipe(concat(callback.bind(null,null)))
     }
 
@@ -118,5 +120,3 @@ var testNoticeResponse = function() {
 }
 
 testNoticeResponse();
-
-
diff --git a/test/index.js b/test/index.js
index 0985e40..a2324ff 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,3 +1,5 @@
+'use strict';
+
 require('./copy-from')
 require('./copy-to')
 require('./binary')