diff --git a/tests/test_tcp.py b/tests/test_tcp.py
index 59c1ae4..2010693 100644
--- a/tests/test_tcp.py
+++ b/tests/test_tcp.py
@@ -45,7 +45,7 @@ class _TestTCP:
             try:
                 srv = await asyncio.start_server(
                     handle_client,
-                    '127.0.0.1', 0,
+                    ('127.0.0.1', 'localhost'), 0,
                     family=socket.AF_INET,
                     loop=self.loop)
 
diff --git a/uvloop/loop.pyx b/uvloop/loop.pyx
index fa03673..eb1f763 100644
--- a/uvloop/loop.pyx
+++ b/uvloop/loop.pyx
@@ -779,7 +779,7 @@ cdef class Loop:
         return self._getaddrinfo(host, port, family, type, proto, flags, 1)
 
     @aio_coroutine
-    async def create_server(self, protocol_factory, str host, int port,
+    async def create_server(self, protocol_factory, host, int port,
                             *,
                             int family=uv.AF_UNSPEC,
                             int flags=uv.AI_PASSIVE,