diff --git a/libkirk/ssh.py b/libkirk/ssh.py
index c8b812a..99b0d82 100644
--- a/libkirk/ssh.py
+++ b/libkirk/ssh.py
@@ -281,7 +281,7 @@ async def run_command(
             cmd = self._create_command(command, cwd, env)
             ret = None
             start_t = 0
-            stdout = None
+            stdout = []
             panic = False
             channel = None
             session = None