diff --git a/tests/integration/aiohttp_utils.py b/tests/integration/aiohttp_utils.py
index e9f9364..6207103 100644
--- a/tests/integration/aiohttp_utils.py
+++ b/tests/integration/aiohttp_utils.py
@@ -4,7 +4,7 @@ import aiohttp
 
 
 @asyncio.coroutine
-def aiohttp_request(loop, method, url, output='text', **kwargs):
+def aiohttp_request(loop, method, url, output='text', encoding='utf-8', **kwargs):
     session = aiohttp.ClientSession(loop=loop)
     response_ctx = session.request(method, url, **kwargs)  # NOQA: E999
 
@@ -12,7 +12,7 @@ def aiohttp_request(loop, method, url, output='text', **kwargs):
     if output == 'text':
         content = yield from response.text()  # NOQA: E999
     elif output == 'json':
-        content = yield from response.json()  # NOQA: E999
+        content = yield from response.json(encoding=encoding)  # NOQA: E999
     elif output == 'raw':
         content = yield from response.read()  # NOQA: E999