diff --git a/flask_bower/__init__.py b/flask_bower/__init__.py
index c4b2b73..a80c879 100644
--- a/flask_bower/__init__.py
+++ b/flask_bower/__init__.py
@@ -2,9 +2,6 @@
 # coding=utf8
 import os
 from flask import abort, json, send_file, Blueprint, current_app, url_for
-import sys
-
-from six import reraise
 
 
 def validate_parameter(param):
@@ -59,11 +56,7 @@ def handle_url_error(error, endpoint, values):
     """
     url = overlay_url_for(endpoint, **values)
     if url is None:
-        exc_type, exc_value, tb = sys.exc_info()
-        if exc_value is error:
-            reraise(exc_type, exc_value, tb)
-        else:
-            raise error
+        raise error
     # url_for will use this result, instead of raising BuildError.
     return url
 
diff --git a/requirements.txt b/requirements.txt
index 2b83ad2..3a850f2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1 @@
 -e git+https://github.com/pallets/flask.git#egg=flask
-six