diff --git a/examples/demo.rs b/examples/demo.rs
index 60b0087..98b6d5e 100644
--- a/examples/demo.rs
+++ b/examples/demo.rs
@@ -28,6 +28,7 @@ pub fn main() {
     flame::end("render");
 
     flame::dump_html(&mut File::create("out.html").unwrap()).unwrap();
+    #[cfg(feature = "json")]
     flame::dump_json(&mut File::create("out.json").unwrap()).unwrap();
     flame::dump_stdout();
 }