diff --git a/index.js b/index.js
index 1301ff0..55a9386 100644
--- a/index.js
+++ b/index.js
@@ -90,7 +90,7 @@ function equal(a, b) {
 
     // custom handling for React/Preact
     for (i = length; i-- !== 0;) {
-      if ((keys[i] === '_owner' || keys[i] === '__v' || keys[i] === '__o') && a.$$typeof) {
+      if ((keys[i] === '_owner' && a.$$typeof) || keys[i] === '__v' || keys[i] === '__o') {
         // React-specific: avoid traversing React elements' _owner
         // Preact-specific: avoid traversing Preact elements' __v and __o
         //    __v = $_original / $_vnode