diff --git a/lib/legacy/class.js b/lib/legacy/class.js
index c64aec55bf..9db14be0be 100644
--- a/lib/legacy/class.js
+++ b/lib/legacy/class.js
@@ -302,7 +302,7 @@ function GenerateClassFromInfo(info, Base, behaviors) {
       */
       // only proceed if the generated class' prototype has not been registered.
       const generatedProto = PolymerGenerated.prototype;
-      if (!generatedProto.hasOwnProperty('__hasRegisterFinished')) {
+      if (!generatedProto.hasOwnProperty(JSCompiler_renameProperty('__hasRegisterFinished', generatedProto))) {
         generatedProto.__hasRegisterFinished = true;
         // ensure superclass is registered first.
         super._registered();
diff --git a/lib/legacy/legacy-element-mixin.js b/lib/legacy/legacy-element-mixin.js
index be7fdc828a..963e496853 100644
--- a/lib/legacy/legacy-element-mixin.js
+++ b/lib/legacy/legacy-element-mixin.js
@@ -194,7 +194,7 @@ export const LegacyElementMixin = dedupingMixin((base) => {
      */
     _initializeProperties() {
       let proto = Object.getPrototypeOf(this);
-      if (!proto.hasOwnProperty('__hasRegisterFinished')) {
+      if (!proto.hasOwnProperty(JSCompiler_renameProperty('__hasRegisterFinished', proto))) {
         this._registered();
         // backstop in case the `_registered` implementation does not set this
         proto.__hasRegisterFinished = true;
diff --git a/lib/mixins/properties-changed.js b/lib/mixins/properties-changed.js
index cc2801d415..854b5b72f8 100644
--- a/lib/mixins/properties-changed.js
+++ b/lib/mixins/properties-changed.js
@@ -113,7 +113,7 @@ export const PropertiesChanged = dedupingMixin(
      */
     _createPropertyAccessor(property, readOnly) {
       this._addPropertyToAttributeMap(property);
-      if (!this.hasOwnProperty('__dataHasAccessor')) {
+      if (!this.hasOwnProperty(JSCompiler_renameProperty('__dataHasAccessor', this))) {
         this.__dataHasAccessor = Object.assign({}, this.__dataHasAccessor);
       }
       if (!this.__dataHasAccessor[property]) {
@@ -131,7 +131,7 @@ export const PropertiesChanged = dedupingMixin(
      * @override
      */
     _addPropertyToAttributeMap(property) {
-      if (!this.hasOwnProperty('__dataAttributes')) {
+      if (!this.hasOwnProperty(JSCompiler_renameProperty('__dataAttributes', this))) {
         this.__dataAttributes = Object.assign({}, this.__dataAttributes);
       }
       // This check is technically not correct; it's an optimization that
diff --git a/lib/mixins/properties-mixin.js b/lib/mixins/properties-mixin.js
index 9420e79769..b13e6e154e 100644
--- a/lib/mixins/properties-mixin.js
+++ b/lib/mixins/properties-mixin.js
@@ -119,7 +119,7 @@ export const PropertiesMixin = dedupingMixin(superClass => {
     * @nocollapse
     */
    static get observedAttributes() {
-     if (!this.hasOwnProperty('__observedAttributes')) {
+     if (!this.hasOwnProperty(JSCompiler_renameProperty('__observedAttributes', this))) {
        register(this.prototype);
        const props = this._properties;
        this.__observedAttributes = props ? Object.keys(props).map(p => this.prototype._addPropertyToAttributeMap(p)) : [];