diff --git a/superset/utils/date_parser.py b/superset/utils/date_parser.py
index aee2c83..bd979f3 100644
--- a/superset/utils/date_parser.py
+++ b/superset/utils/date_parser.py
@@ -32,6 +32,7 @@
     Group,
     Optional as ppOptional,
     ParseException,
+    ParserElement,
     ParseResults,
     pyparsing_common,
     quotedString,
@@ -40,6 +41,8 @@
 
 from .core import memoized
 
+ParserElement.enablePackrat()
+
 logger = logging.getLogger(__name__)
 
 
@@ -375,7 +378,7 @@
         raise ValueError(_("Unable to find such a holiday: [{}]").format(holiday))
 
 
-@memoized()
+@memoized
 def datetime_parser() -> ParseResults:  # pylint: disable=too-many-locals
     (  # pylint: disable=invalid-name
         DATETIME,