diff --git a/config/jsdoc/api/plugins/events.js b/config/jsdoc/api/plugins/events.js
index b1ffa9dfba..6656d7b58c 100644
--- a/config/jsdoc/api/plugins/events.js
+++ b/config/jsdoc/api/plugins/events.js
@@ -12,7 +12,7 @@ exports.handlers = {
         events[cls] = [];
       }
       events[cls].push(doclet.longname);
-    } else if (doclet.kind == 'class') {
+    } else if (doclet.kind == 'class' && !(doclet.longname in classes)) {
       classes[doclet.longname] = doclet;
     }
   },
diff --git a/config/jsdoc/api/plugins/observable.js b/config/jsdoc/api/plugins/observable.js
index 44e7353c54..744be13123 100644
--- a/config/jsdoc/api/plugins/observable.js
+++ b/config/jsdoc/api/plugins/observable.js
@@ -5,7 +5,7 @@ exports.handlers = {
 
   newDoclet: function(e) {
     const doclet = e.doclet;
-    if (doclet.kind == 'class') {
+    if (doclet.kind == 'class' && !(doclet.longname in classes)) {
       classes[doclet.longname] = doclet;
     }
   },