diff --git a/pytec/pytec/aioclient.py b/pytec/pytec/aioclient.py
index 6fdfc60..d88ebfe 100644
--- a/pytec/pytec/aioclient.py
+++ b/pytec/pytec/aioclient.py
@@ -97,7 +97,7 @@ class Client:
             line = await asyncio.shield(self._read_write(command))
 
         response = json.loads(line)
-        logging.debug(f"{command}: {response}")
+        logging.debug("%s: %s", command, response)
         if "error" in response:
             raise CommandError(response["error"])
         return response