diff --git a/lib/utils/templatize.html b/lib/utils/templatize.html
index 18a1161095..85812500b9 100644
--- a/lib/utils/templatize.html
+++ b/lib/utils/templatize.html
@@ -175,14 +175,12 @@
             // remove and replace slot
             } else if (n.localName === 'slot') {
               if (hide) {
-                n.__polymerParent__ = n.parentNode;
                 n.__polymerReplaced__ = document.createComment('hidden-slot');
                 n.parentNode.replaceChild(n.__polymerReplaced__, n);
               } else {
-                const parent = n.__polymerParent__;
                 const replace = n.__polymerReplaced__;
-                if (parent && replace) {
-                  parent.replaceChild(n, replace);
+                if (replace) {
+                  replace.parentNode.replaceChild(n, replace);
                 }
               }
             }