diff --git a/swh/graph/rpc_server.py b/swh/graph/rpc_server.py
index 20ee1e7..540fc5d 100644
--- a/swh/graph/rpc_server.py
+++ b/swh/graph/rpc_server.py
@@ -1,46 +1,47 @@
 # Copyright (C) 2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 """
 A simple tool to start the swh-graph GRPC server in Java.
 """
 
 import logging
-import shlex
 import subprocess
 
 import aiohttp.test_utils
 import aiohttp.web
 
 from swh.graph.config import check_config
 
 
 def spawn_java_rpc_server(config, port=None):
     if port is None:
         port = aiohttp.test_utils.unused_port()
     config = check_config(config or {})
     cmd = [
         "java",
         "-cp",
         config["classpath"],
         *config["java_tool_options"].split(),
         "org.softwareheritage.graph.rpc.GraphServer",
         "--port",
         str(port),
         str(config["graph"]["path"]),
     ]
     print(cmd)
-    logging.info("Starting RPC server: %s", shlex.join(cmd))
+    # XXX: shlex.join() is in 3.8
+    # logging.info("Starting RPC server: %s", shlex.join(cmd))
+    logging.info("Starting RPC server: %s", str(cmd))
     server = subprocess.Popen(cmd)
     return server, port
 
 
 def stop_java_rpc_server(server: subprocess.Popen, timeout: int = 15):
     server.terminate()
     try:
         server.wait(timeout=timeout)
     except subprocess.TimeoutExpired:
         logging.warning("Server did not terminate, sending kill signal...")
         server.kill()