diff --git a/src/constants.js b/src/constants.js
index 6c6a59e..bad5944 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -68,7 +68,7 @@ define(function(require) {
 
     SUPER_NODE_ID: '00000000-0000-0000-0000-000000000000',
 
-    //Reserved FileDescriptors for streams
+    // Reserved File Descriptors for streams
     STDIN: 0,
     STDOUT: 1,
     STDERR: 2,
@@ -80,4 +80,4 @@ define(function(require) {
     }
   };
 
-});
\ No newline at end of file
+});
diff --git a/src/filesystem/interface.js b/src/filesystem/interface.js
index 8704835..9e14385 100644
--- a/src/filesystem/interface.js
+++ b/src/filesystem/interface.js
@@ -22,7 +22,7 @@ define(function(require) {
   var STDIN = require('src/constants').STDIN;
   var STDOUT = require('src/constants').STDOUT;
   var STDERR = require('src/constants').STDERR;
-  var FD = require('src/constants').FIRST_DESCRIPTOR;
+  var FIRST_DESCRIPTOR = require('src/constants').FIRST_DESCRIPTOR;
 
   // The core fs operations live on impl
   var impl = require('src/filesystem/implementation');
@@ -82,12 +82,11 @@ define(function(require) {
     fs.stdin = STDIN;
     fs.stdout = STDOUT;
     fs.stderr = STDERR;
-    fs.firstFD = FD;
 
     // Safely expose the list of open files and file
     // descriptor management functions
     var openFiles = {};
-    var nextDescriptor = 3;
+    var nextDescriptor = FIRST_DESCRIPTOR;
     Object.defineProperty(this, "openFiles", {
       get: function() { return openFiles; }
     });
diff --git a/tests/spec/fs.open.spec.js b/tests/spec/fs.open.spec.js
index 6ab8cf4..0dd4c87 100644
--- a/tests/spec/fs.open.spec.js
+++ b/tests/spec/fs.open.spec.js
@@ -62,7 +62,7 @@ define(["Filer", "util"], function(Filer, util) {
 
     it('should return a unique file descriptor', function(done) {
       var fs = util.fs();
-      var fd1
+      var fd1;
 
       fs.open('/file1', 'w+', function(error, fd) {
         if(error) throw error;
@@ -79,6 +79,18 @@ define(["Filer", "util"], function(Filer, util) {
       });
     });
 
+    it('should return the argument value of the file descriptor index matching the value set by the first useable file descriptor constant', function(done) {
+      var fs = util.fs();
+      var firstFD = require('src/constants').FIRST_DESCRIPTOR;
+      var fd1;
+
+      fs.open('/file1', 'w+', function(error, fd) {
+        if(error) throw error;
+        expect(fd).to.equal(firstFD);
+        done();
+      });
+    });
+
     it('should create a new file when flagged for write', function(done) {
       var fs = util.fs();