diff --git a/rtio/rtlink.py b/rtio/rtlink.py
index cd9d0e0..8fb5214 100644
--- a/rtio/rtlink.py
+++ b/rtio/rtlink.py
@@ -1,6 +1,6 @@
 from nmigen import *
 
-class OInterface(object):
+class OInterface:
     def __init__(self, data_width, address_width=0,
         fine_ts_width=0, enable_replace=True,
         delay=0):
@@ -32,7 +32,7 @@ class OInterface(object):
             other.enable_replace,
             other.delay)
 
-class IInterface(object):
+class IInterface:
     def __init__(self, data_width,
         timestamped=True, fine_ts_width=0, delay=0):
         self.stb = Signal()
@@ -58,7 +58,7 @@ class IInterface(object):
             get_fine_ts_width(other),
             other.delay)
 
-class Interface(object):
+class Interface:
     def __init__(self, o, i=None):
         self.o = o
         self.i = i