diff --git a/src/value.ts b/src/value.ts
index 3635305..4edb9e4 100644
--- a/src/value.ts
+++ b/src/value.ts
@@ -141,7 +141,6 @@ export function isEqual(a: Value, b: Value): boolean {
       return true
     }
     case 'regex': {
-      if (!(b.value instanceof RegExp)) return false
       return String(a.value) === String(b.value)
     }
     case 'function':