diff --git a/zerver/lib/cache.py b/zerver/lib/cache.py
index b06e448c87..1ee5eb401c 100644
--- a/zerver/lib/cache.py
+++ b/zerver/lib/cache.py
@@ -248,17 +248,18 @@ def get_stream_cache_key(stream_name, realm):
     return "stream_by_realm_and_name:%s:%s" % (
         realm_id, make_safe_digest(stream_name.strip().lower()))
 
-def update_user_profile_caches(user_profile):
+def update_user_profile_caches(user_profiles):
     items_for_memcached = {}
-    items_for_memcached[user_profile_by_email_cache_key(user_profile.email)] = (user_profile,)
-    items_for_memcached[user_profile_by_id_cache_key(user_profile.id)] = (user_profile,)
+    for user_profile in user_profiles:
+        items_for_memcached[user_profile_by_email_cache_key(user_profile.email)] = (user_profile,)
+        items_for_memcached[user_profile_by_id_cache_key(user_profile.id)] = (user_profile,)
     cache_set_many(items_for_memcached)
 
 # Called by models.py to flush the user_profile cache whenever we save
 # a user_profile object
 def flush_user_profile(sender, **kwargs):
     user_profile = kwargs['instance']
-    update_user_profile_caches(user_profile)
+    update_user_profile_caches([user_profile])
 
     # Invalidate our active_users_in_realm info dict if any user has changed
     # name or email
@@ -272,8 +273,8 @@ def flush_user_profile(sender, **kwargs):
         cache_delete(realm_alert_words_cache_key(user_profile.realm))
 
 def flush_realm(realm):
-    for user in realm.get_active_users():
-        update_user_profile_caches(user)
+    users = realm.get_active_users()
+    update_user_profile_caches(users)
 
     if realm.deactivated:
         cache_delete(active_user_dicts_in_realm_cache_key(realm))