diff --git a/beets/util/__init__.py b/beets/util/__init__.py
index f6cd488d6..5db205c02 100644
--- a/beets/util/__init__.py
+++ b/beets/util/__init__.py
@@ -801,6 +801,7 @@ def command_output(cmd, shell=False):
         cmd,
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE,
+        stdin=subprocess.DEVNULL,
         close_fds=platform.system() != 'Windows',
         shell=shell
     )