diff --git a/rflx/parser/grammar.py b/rflx/parser/grammar.py
index c3fafc25d..9df781c06 100644
--- a/rflx/parser/grammar.py
+++ b/rflx/parser/grammar.py
@@ -8,6 +8,7 @@
     Literal,
     Optional,
     ParseFatalException,
+    ParserElement,
     ParseResults,
     QuotedString,
     Regex,
@@ -70,6 +71,8 @@
     Then,
 )
 
+ParserElement.enablePackrat()
+
 
 def comma() -> Token:
     return Suppress(Literal(",")).setName('","')