diff --git a/lib/mixins/property-accessors.js b/lib/mixins/property-accessors.js
index 074abdea74..bfa7f33a7e 100644
--- a/lib/mixins/property-accessors.js
+++ b/lib/mixins/property-accessors.js
@@ -164,7 +164,7 @@ export const PropertyAccessors = dedupingMixin(superClass => {
      * setter at instance time.  This method is provided as an override
      * point for customizing or providing more efficient initialization.
      *
-     * @param {!Object} props Bag of property values that were overwritten
+     * @param {Object} props Bag of property values that were overwritten
      *   when creating property accessors.
      * @return {void}
      * @protected