diff --git a/lib/legacy/class.html b/lib/legacy/class.html
index 0ceb6471dd..10cf73b449 100644
--- a/lib/legacy/class.html
+++ b/lib/legacy/class.html
@@ -161,7 +161,7 @@
             // next look for superclass template (note: use superclass symbol
             // to ensure correct `this.is`)
             Base.template ||
-            // finally fall back to `_template` in element's protoype.
+            // finally fall back to `_template` in element's prototype.
             this.prototype._template ||
             null;
         }