diff --git a/asciinema/recorder.py b/asciinema/recorder.py
index 37811af..5c51319 100644
--- a/asciinema/recorder.py
+++ b/asciinema/recorder.py
@@ -15,7 +15,7 @@ def record(path, command=None, append=False, idle_time_limit=None,
 
     if command_env is None:
         command_env = os.environ.copy()
-        command_env['ASCIINEMA_REC'] = '1'
+    command_env['ASCIINEMA_REC'] = '1'
 
     if capture_env is None:
         capture_env = ['SHELL', 'TERM']