diff --git a/Libraries/LibJS/Parser.cpp b/Libraries/LibJS/Parser.cpp
index 7458131a86f..7e64c775255 100644
--- a/Libraries/LibJS/Parser.cpp
+++ b/Libraries/LibJS/Parser.cpp
@@ -4266,18 +4266,12 @@ bool Parser::match_declaration(AllowUsingDeclaration allow_using) const
         || type == TokenType::Let;
 }
 
-Token Parser::next_token(size_t steps) const
+Token Parser::next_token() const
 {
-    Lexer lookahead_lexer = m_state.lexer;
-
-    Token lookahead_token;
-
-    while (steps > 0) {
-        lookahead_token = lookahead_lexer.next();
-        steps--;
-    }
-
-    return lookahead_token;
+    // We need to keep the lookahead lexer alive to prevent UAF on the lookahead token, as the token may hold a view
+    // into a short string stored on the stack.
+    m_state.lookahead_lexer = m_state.lexer;
+    return m_state.lookahead_lexer->next();
 }
 
 bool Parser::try_match_let_declaration() const
diff --git a/Libraries/LibJS/Parser.h b/Libraries/LibJS/Parser.h
index c9d983ce939..edf4252d743 100644
--- a/Libraries/LibJS/Parser.h
+++ b/Libraries/LibJS/Parser.h
@@ -257,7 +257,7 @@ private:
 
     RefPtr<BindingPattern const> synthesize_binding_pattern(Expression const& expression);
 
-    Token next_token(size_t steps = 1) const;
+    Token next_token() const;
 
     void check_identifier_name_for_assignment_validity(FlyString const&, bool force_strict = false);
 
@@ -302,6 +302,7 @@ private:
 
     struct ParserState {
         Lexer lexer;
+        mutable Optional<Lexer> lookahead_lexer;
         Token current_token;
         bool previous_token_was_period { false };
         Vector<ParserError> errors;