diff --git a/zephyr/tornadoviews.py b/zephyr/tornadoviews.py
index c6fc198944..3b5ffa8619 100644
--- a/zephyr/tornadoviews.py
+++ b/zephyr/tornadoviews.py
@@ -88,7 +88,7 @@ user_messages = {}
 # we're running within tornado, we don't want to have to do a database
 # lookup to find the matching entry in this table.
 stream_messages = {}
-USERMESSAGE_CACHE_COUNT = 25000
+USERMESSAGE_CACHE_COUNT = 50000
 STREAMMESSAGE_CACHE_COUNT = 5000
 cache_minimum_id = sys.maxint
 def initialize_user_messages():