diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index 2125548..1fbdd31 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -206,6 +206,10 @@
             raise TypeError('ssl argument must be an SSLContext or None')
 
         if path is not None:
+            if sock is not None:
+                raise ValueError(
+                    'path and sock can not be specified at the same time')
+
             sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
 
             try: