diff --git a/test/others/rpc/setup_swrk.py b/test/others/rpc/setup_swrk.py
index c7f84f952..ffaa01de4 100644
--- a/test/others/rpc/setup_swrk.py
+++ b/test/others/rpc/setup_swrk.py
@@ -5,12 +5,6 @@ import subprocess
 def setup_swrk():
     print('Connecting to CRIU in swrk mode.')
     s1, s2 = socket.socketpair(socket.AF_UNIX, socket.SOCK_SEQPACKET)
-
-    kwargs = {}
-    if sys.version_info.major == 3:
-        kwargs["pass_fds"] = [s1.fileno()]
-
-    swrk = subprocess.Popen(['./criu', "swrk", "%d" % s1.fileno()], **kwargs)
+    swrk = subprocess.Popen(['./criu', "swrk", "%d" % s1.fileno()], pass_fds=[s1.fileno()])
     s1.close()
     return swrk, s2
-