diff --git a/zerver/lib/actions.py b/zerver/lib/actions.py
index e5b880550e..7b310a1105 100644
--- a/zerver/lib/actions.py
+++ b/zerver/lib/actions.py
@@ -2426,11 +2426,8 @@ def get_status_dict(requesting_user_profile):
 
 
 def get_realm_user_dicts(user_profile):
-    # Due to our permission model, it is advantageous to find the admin users in bulk.
-    admins = user_profile.realm.get_admin_users()
-    admin_emails = set([up.email for up in admins])
     return [{'email'     : userdict['email'],
-             'is_admin'  : userdict['email'] in admin_emails,
+             'is_admin'  : userdict['is_realm_admin'],
              'is_bot'    : userdict['is_bot'],
              'full_name' : userdict['full_name']}
             for userdict in get_active_user_dicts_in_realm(user_profile.realm)]
diff --git a/zerver/lib/cache.py b/zerver/lib/cache.py
index eda6d268b1..facd942d0a 100644
--- a/zerver/lib/cache.py
+++ b/zerver/lib/cache.py
@@ -268,7 +268,7 @@ def cache_save_user_profile(user_profile):
     # type: (Any) -> None
     cache_set(user_profile_by_id_cache_key(user_profile.id), user_profile, timeout=3600*24*7)
 
-active_user_dict_fields = ['id', 'full_name', 'short_name', 'email', 'is_bot']
+active_user_dict_fields = ['id', 'full_name', 'short_name', 'email', 'is_realm_admin', 'is_bot']
 def active_user_dicts_in_realm_cache_key(realm):
     # type: (Any) -> str
     return "active_user_dicts_in_realm:%s" % (realm.id,)