diff --git a/tailbone/views/batch/core.py b/tailbone/views/batch/core.py
index 150dd560..e8e84353 100644
--- a/tailbone/views/batch/core.py
+++ b/tailbone/views/batch/core.py
@@ -830,7 +830,9 @@ class BatchMasterView(MasterView):
                           subcommand=None, subcommand_args=None):
 
         # construct command
-        cmd = [os.path.join(sys.prefix, 'bin/{}'.format(command))]
+        prefix = self.rattail_config.get('rattail', 'command_prefix',
+                                         default=sys.prefix)
+        cmd = [os.path.join(prefix, 'bin/{}'.format(command))]
         for path in self.rattail_config.files_read:
             cmd.extend(['--config', path])
         if username:
@@ -846,6 +848,7 @@ class BatchMasterView(MasterView):
             cmd.extend(subcommand_args)
 
         # run command in subprocess
+        log.debug("launching command in subprocess: %s", cmd)
         subprocess.check_call(cmd)
 
     def action_subprocess_thread(self, batch_uuid, port, username, action, progress):