diff --git a/flamenco_worker/worker.py b/flamenco_worker/worker.py
index f90d149..f1d9348 100644
--- a/flamenco_worker/worker.py
+++ b/flamenco_worker/worker.py
@@ -930,7 +930,7 @@ class FlamencoWorker:
                 self._log.info("Sending 1 path(s) to Manager")
                 resp = await self.manager.post(
                     "/output-produced",
-                    json={"paths": [str(path)]},
+                    json={"paths": [path.as_posix()]},
                     loop=self.loop,
                 )
                 if resp.status_code == 204: