diff --git a/bots/zephyr_mirror.py b/bots/zephyr_mirror.py
index c40fec1..6bb454c 100755
--- a/bots/zephyr_mirror.py
+++ b/bots/zephyr_mirror.py
@@ -511,7 +511,7 @@ web interface.
             print
 
 def valid_stream_name(name):
-    return True
+    return name != ""
 
 def parse_zephyr_subs(verbose=False):
     zephyr_subscriptions = set()