diff --git a/lib/mixins/element-mixin.html b/lib/mixins/element-mixin.html
index ae7db9423d..278703e526 100644
--- a/lib/mixins/element-mixin.html
+++ b/lib/mixins/element-mixin.html
@@ -442,7 +442,7 @@
       /**
        * Set the template.
        *
-       * @param {!HTMLTemplateElement|string} value Template to set.
+       * @param {HTMLTemplateElement|string} value Template to set.
        */
       static set template(value) {
         this._template = value;