diff --git a/pytec/pytec/aioclient.py b/pytec/pytec/aioclient.py
index df7fef9..bd46c79 100644
--- a/pytec/pytec/aioclient.py
+++ b/pytec/pytec/aioclient.py
@@ -70,7 +70,7 @@ class AsyncioClient:
             line = await 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