diff --git a/indexdigest/linters/linter_0028_data_too_old.py b/indexdigest/linters/linter_0028_data_too_old.py
index 7ea9ce9d..bc06ad7a 100644
--- a/indexdigest/linters/linter_0028_data_too_old.py
+++ b/indexdigest/linters/linter_0028_data_too_old.py
@@ -5,7 +5,7 @@
 from datetime import datetime
 from time import time
 
-from indexdigest.utils import LinterEntry
+from indexdigest.utils import LinterEntry, memoize
 
 
 def get_time_columns(database):
@@ -28,6 +28,7 @@ def get_time_columns(database):
         yield (table_name, time_columns[0])
 
 
+@memoize
 def get_boundary_times(database, table_name, column):
     """
     :type database  indexdigest.database.Database