diff --git a/src/parser/internal/identifiers.rs b/src/parser/internal/identifiers.rs
index a90b05a..319d3c2 100644
--- a/src/parser/internal/identifiers.rs
+++ b/src/parser/internal/identifiers.rs
@@ -103,6 +103,9 @@ pub fn is_reserved_ident(kind: &TokenKind) -> bool {
             | TokenKind::Parent
             | TokenKind::Self_
             | TokenKind::Abstract
+            | TokenKind::True
+            | TokenKind::False
+            | TokenKind::Null
             | TokenKind::Final
             | TokenKind::For
             | TokenKind::Private