diff --git a/headers.js b/headers.js
index cf978e1..6efbc4a 100644
--- a/headers.js
+++ b/headers.js
@@ -9,7 +9,7 @@ var MASK = parseInt('7777', 8)
 
 var clamp = function (index, len, defaultValue) {
   if (typeof index !== 'number') return defaultValue
-  index = ~~index  // Coerce to integer.
+  index = ~~index // Coerce to integer.
   if (index >= len) return len
   if (index >= 0) return index
   index += len
diff --git a/pack.js b/pack.js
index 0bb57f6..72d96a0 100644
--- a/pack.js
+++ b/pack.js
@@ -1,4 +1,4 @@
-var constants = require('constants')
+var constants = require('fs-constants')
 var eos = require('end-of-stream')
 var util = require('util')
 var alloc = require('buffer-alloc')
diff --git a/package.json b/package.json
index 83d3475..f593a30 100644
--- a/package.json
+++ b/package.json
@@ -10,14 +10,15 @@
     "bl": "^1.0.0",
     "buffer-alloc": "^1.1.0",
     "end-of-stream": "^1.0.0",
+    "fs-constants": "^1.0.0",
     "readable-stream": "^2.0.0",
     "to-buffer": "^1.1.0",
     "xtend": "^4.0.0"
   },
   "devDependencies": {
-    "concat-stream": "^1.4.6",
-    "standard": "^5.3.1",
-    "tape": "^3.0.3"
+    "concat-stream": "^1.6.2",
+    "standard": "^11.0.1",
+    "tape": "^4.9.0"
   },
   "scripts": {
     "test": "standard && tape test/extract.js test/pack.js",
diff --git a/test/extract.js b/test/extract.js
index 0cf3123..09887b5 100644
--- a/test/extract.js
+++ b/test/extract.js
@@ -6,7 +6,7 @@ var fs = require('fs')
 
 var clamp = function (index, len, defaultValue) {
   if (typeof index !== 'number') return defaultValue
-  index = ~~index  // Coerce to integer.
+  index = ~~index // Coerce to integer.
   if (index >= len) return len
   if (index >= 0) return index
   index += len
diff --git a/test/pack.js b/test/pack.js
index 946879e..fef5dc1 100644
--- a/test/pack.js
+++ b/test/pack.js
@@ -111,7 +111,7 @@ test('types', function (t) {
     gname: 'staff',
     uid: 501,
     gid: 20,
-    size: 9  // Should convert to zero
+    size: 9 // Should convert to zero
   })
 
   pack.finalize()
diff --git a/test/slow.js b/test/slow.js
index c8a1bc0..44bec54 100644
--- a/test/slow.js
+++ b/test/slow.js
@@ -10,7 +10,7 @@ test('huge', function (t) {
 
   var extract = tar.extract()
   var noEntries = false
-  var hugeFileSize = 8804630528  // ~8.2GB
+  var hugeFileSize = 8804630528 // ~8.2GB
   var dataLength = 0
 
   var countStream = new stream.Writable()