diff --git a/src/util/isIdentifier.ts b/src/util/isIdentifier.ts
index 672df913..2351bdfd 100644
--- a/src/util/isIdentifier.ts
+++ b/src/util/isIdentifier.ts
@@ -21,6 +21,7 @@ const RESERVED_WORDS = new Set([
   "else",
   "export",
   "extends",
+  "false",
   "finally",
   "for",
   "function",
@@ -34,6 +35,7 @@ const RESERVED_WORDS = new Set([
   "switch",
   "this",
   "throw",
+  "true",
   "try",
   "typeof",
   "var",