diff --git a/packages/fullstack/src/launch.rs b/packages/fullstack/src/launch.rs
index f66174cc2..3b751bd9f 100644
--- a/packages/fullstack/src/launch.rs
+++ b/packages/fullstack/src/launch.rs
@@ -64,7 +64,7 @@ pub fn launch(
 #[allow(unused)]
 pub fn launch(
     root: fn() -> Element,
-    contexts: Vec<Box<dyn Fn() -> Box<dyn Any> + Send + Sync>>,
+    contexts: Vec<Box<dyn Fn() -> Box<dyn Any + Send + Sync> + Send + Sync>>,
     platform_config: Config,
 ) -> ! {
     let contexts = Arc::new(contexts);