diff --git a/asyncio/event.py b/asyncio/event.py
index 04f6e15..f26174c 100644
--- a/asyncio/event.py
+++ b/asyncio/event.py
@@ -71,9 +71,9 @@ async def wait(self):
 # that asyncio will poll until a flag is set.
 # Note: Unlike Event, this is self-clearing.
 try:
-    import uio
+    import io
 
-    class ThreadSafeFlag(uio.IOBase):
+    class ThreadSafeFlag(io.IOBase):
         def __init__(self):
             self._flag = 0