diff --git a/mocket/mocket.py b/mocket/mocket.py
index 380064cb..d90ba625 100644
--- a/mocket/mocket.py
+++ b/mocket/mocket.py
@@ -261,7 +261,7 @@ def sendall(self, data, entry=None, *args, **kwargs):
     def read(self, buffersize):
         return self.fd.read(buffersize)
 
-    def recv_into(self, buffer, buffersize, flags=None):
+    def recv_into(self, buffer, buffersize=None, flags=None):
         return buffer.write(self.fd.read(buffersize))
 
     def recv(self, buffersize, flags=None):
diff --git a/tests/main/test_mocket.py b/tests/main/test_mocket.py
index 3ebe56a5..d54a5c77 100644
--- a/tests/main/test_mocket.py
+++ b/tests/main/test_mocket.py
@@ -82,7 +82,7 @@ def test_getresponse(self):
     def test_empty_getresponse(self):
         entry = MocketEntry(('localhost', 8080), [])
         self.assertEqual(entry.get_response(), encode_to_bytes(''))
-        
+
     def test_subsequent_recv_requests_have_correct_length(self):
         Mocket.register(
             MocketEntry(
@@ -119,7 +119,7 @@ def test_recv_into(self):
             _so.sendall(b'first\r\n')
             assert _so.recv_into(buffer, 4096) == 12
             _so.sendall(b'second\r\n')
-            assert _so.recv_into(buffer, 4096) == 5
+            assert _so.recv_into(buffer) == 5
             _so.close()
         buffer.seek(0)
         assert buffer.read() == b'Long payloadShort'