diff --git a/test/io/util.py b/test/io/util.py
index 7a0610003..ba655c83b 100644
--- a/test/io/util.py
+++ b/test/io/util.py
@@ -24,14 +24,6 @@ class Thread(threading.Thread):
             raise self._exception
 
 
-def freeport():
-    "Find a free port on localhost."
-    with contextlib.closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as s:
-        s.bind(("", 0))
-        s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-        return s.getsockname()[1]
-
-
 def authheader(token):
     "Bearer token HTTP authorization header."
     return {"Authorization": f"Bearer {token}"}