diff --git a/swift/common/middleware/s3api/subresource.py b/swift/common/middleware/s3api/subresource.py
index c941040d8b..1aa47b4b2d 100644
--- a/swift/common/middleware/s3api/subresource.py
+++ b/swift/common/middleware/s3api/subresource.py
@@ -182,18 +182,19 @@ class Grantee(object):
         """
         Convert a grantee string in the HTTP header to an Grantee instance.
         """
-        type, value = grantee.split('=', 1)
+        grantee_type, value = grantee.split('=', 1)
+        grantee_type = grantee_type.lower()
         value = value.strip('"\'')
-        if type == 'id':
+        if grantee_type == 'id':
             return User(value)
-        elif type == 'emailAddress':
+        elif grantee_type == 'emailaddress':
             raise S3NotImplemented()
-        elif type == 'uri':
+        elif grantee_type == 'uri':
             # return a subclass instance of Group class
             subclass = get_group_subclass_from_uri(value)
             return subclass()
         else:
-            raise InvalidArgument(type, value,
+            raise InvalidArgument(grantee_type, value,
                                   'Argument format not recognized')
 
 
diff --git a/test/unit/common/middleware/s3api/test_s3_acl.py b/test/unit/common/middleware/s3api/test_s3_acl.py
index 554f09ec5a..3c4eeae2fd 100644
--- a/test/unit/common/middleware/s3api/test_s3_acl.py
+++ b/test/unit/common/middleware/s3api/test_s3_acl.py
@@ -379,6 +379,17 @@ class TestS3ApiS3Acl(S3ApiTestCase):
         status, headers, body = self.call_s3api(req)
         self.assertEqual(status.split()[0], '200')
 
+    def test_grant_all_users_with_uppercase_type(self):
+        req = Request.blank('/bucket/object?acl',
+                            environ={'REQUEST_METHOD': 'PUT'},
+                            headers={'Authorization': 'AWS test:tester:hmac',
+                                     'Date': self.get_date_header(),
+                                     'x-amz-grant-read':
+                                     'URI="http://acs.amazonaws.com/groups/'
+                                     'global/AllUsers"'})
+        status, headers, body = self.call_s3api(req)
+        self.assertEqual(status.split()[0], '200')
+
     def test_grant_invalid_uri(self):
         req = Request.blank('/bucket/object?acl',
                             environ={'REQUEST_METHOD': 'PUT'},