diff --git a/src/fastboot-headers.js b/src/fastboot-headers.js
index 450adc177..6f440a750 100644
--- a/src/fastboot-headers.js
+++ b/src/fastboot-headers.js
@@ -17,7 +17,7 @@ class FastBootHeaders {
         value = [value];
       }
 
-      this.headers[header] = value;
+      this.headers[header.toLowerCase()] = value;
     }
   }
 
diff --git a/test/fastboot-headers-test.js b/test/fastboot-headers-test.js
index 3a0399efe..065ad0394 100644
--- a/test/fastboot-headers-test.js
+++ b/test/fastboot-headers-test.js
@@ -6,6 +6,15 @@ var FastBootHeaders = require('./../src/fastboot-headers.js');
 var Ember = require('ember-source/dist');
 
 describe('FastBootHeaders', function() {
+  it('lower normalizes the headers to lowercase', function() {
+    var headers = {
+      'X-Test-Header': 'value1, value2'
+    };
+    headers = new FastBootHeaders(headers);
+
+    expect(headers.getAll('x-test-header')).to.deep.equal(['value1, value2']);
+  });
+
   it('returns an array from getAll when header value is string', function() {
     var headers = {
       'x-test-header': 'value1, value2'