diff --git a/examples/chromium-fake-render-frame-host/src/render_frame_host.rs b/examples/chromium-fake-render-frame-host/src/render_frame_host.rs
index 9c2bf51..761c8a8 100644
--- a/examples/chromium-fake-render-frame-host/src/render_frame_host.rs
+++ b/examples/chromium-fake-render-frame-host/src/render_frame_host.rs
@@ -209,7 +209,7 @@
     }
 }
 
-#[is_subclass(superclass("content::WebContentsObserver"))]
+#[subclass(superclass("content::WebContentsObserver"))]
 #[doc(hidden)]
 pub struct RenderFrameHostForWebContents {
     rfh: *mut ffi::content::RenderFrameHost,