diff --git a/js/src/common/Component.ts b/js/src/common/Component.ts
index 0bf2eeaa2..551b94054 100644
--- a/js/src/common/Component.ts
+++ b/js/src/common/Component.ts
@@ -63,7 +63,7 @@ export default abstract class Component<T extends ComponentAttrs = any> implemen
     return m(this as any, componentProps, children);
   }
 
-  private setAttrs(attrs: T) {
+  private setAttrs(attrs: T = {} as T) {
     this.initAttrs(attrs);
 
     if (attrs && 'children' in attrs) {