diff --git a/webservice/webservice.py b/webservice/webservice.py
index 4905d7b43efac8d52d276e54124879f68049be94..6e89c1ebe9f7a0c166ab9db4c187eccd6c0963d1 100644
--- a/webservice/webservice.py
+++ b/webservice/webservice.py
@@ -484,7 +484,8 @@ async def run_action(job_db, cmd, mode, proposal, run, rid) -> str:
         retcode, stdout, stderr = await run_proc_async(cmd)
         if retcode != 0:
             logging.error(Errors.JOB_LAUNCH_FAILED.format(cmd, retcode))
-            logging.error(f"{stdout=}, {stderr=}")
+            logging.error(f"Failed process stdout:\n%s\nFailed process stderr:\n%s",
+                          stdout.decode(errors='replace'), stderr.decode(errors='replace'))
             return Errors.JOB_LAUNCH_FAILED.format(cmd, retcode)
 
         if "DARK" in cmd: