diff --git a/TOOLS/umpv b/TOOLS/umpv
index 162b4de467..d701166f72 100755
--- a/TOOLS/umpv
+++ b/TOOLS/umpv
@@ -13,7 +13,8 @@ otherwise not playable, mpv will skip the playlist entry when attempting to
 play it (from the GUI perspective, it's silently ignored).
 
 If mpv isn't running yet, this script will start mpv and let it control the
-current terminal.
+current terminal. It will not write output to stdout/stderr, because this
+will typically just fill ~/.xsession-errors with garbage.
 
 mpv will terminate if there are no more files to play, and running the umpv
 script after that will start a new mpv instance.
@@ -88,4 +89,5 @@ else:
             raise e
     os.mkfifo(FIFO, 0600)
 
-    subprocess.check_call(["mpv", "--force-window", "--input-file=" + FIFO] + files)
+    subprocess.check_call(["mpv", "--really-quiet", "--force-window",
+                           "--input-file=" + FIFO, "--"] + files)