diff --git a/src/parser.cc b/src/parser.cc
index e2677b5f0e..41667c2eac 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -3749,6 +3749,7 @@ PreParser::PreParseResult Parser::ParseLazyFunctionBodyWithPreParser(
     reusable_preparser_->set_allow_arrow_functions(allow_arrow_functions());
     reusable_preparser_->set_allow_harmony_numeric_literals(
         allow_harmony_numeric_literals());
+    reusable_preparser_->set_allow_classes(allow_classes());
   }
   PreParser::PreParseResult result =
       reusable_preparser_->PreParseLazyFunction(strict_mode(),