diff --git a/flamenco_worker/commands.py b/flamenco_worker/commands.py
index 78a12b5c246a0d5aceaacc053f34fb80dc73307c..c95ff082b2a76c2a14697a1aafc4c20c7cc969d0 100644
--- a/flamenco_worker/commands.py
+++ b/flamenco_worker/commands.py
@@ -1126,7 +1126,7 @@ class ConcatenateVideosCommand(AbstractFFmpegCommand):
                 self.index_file.unlink()
             except IOError:
                 msg = f'unable to unlink file {self.index_file}, ignoring'
-                self.worker.register_log(msg)
+                await self.worker.register_log(msg)
                 self._log.warning(msg)
 
     def ffmpeg_args(self, settings: Settings) -> typing.List[str]: