diff --git a/obs/update_unstable.py b/obs/update_unstable.py
index cb1a2f7..01f2712 100755
--- a/obs/update_unstable.py
+++ b/obs/update_unstable.py
@@ -176,7 +176,7 @@ def notify_matrix(update_data: Dict[str, List[Tuple[str, str]]]) -> None:
 
     message = template.render(repositories=update_data, date=date)
 
-    cmd = [MATRIX_COMMANDER, "--markdown", "--loglevel", "ERROR",
+    cmd = [MATRIX_COMMANDER, "--markdown", "--log-level", "ERROR",
            "-m", message]
     logging.debug("Sending Matrix notification")
     sarge.run(cmd, stdout=subprocess.DEVNULL)