diff --git a/leptos_dom/Cargo.toml b/leptos_dom/Cargo.toml
index f9e345a33..7ae65aa3b 100644
--- a/leptos_dom/Cargo.toml
+++ b/leptos_dom/Cargo.toml
@@ -17,6 +17,7 @@ base64 = { version = "0.21", optional = true }
 getrandom = { version = "0.2", optional = true }
 js-sys = "0.3"
 rand = { version = "0.8", optional = true }
+send_wrapper = "0.6"
 tracing = "0.1"
 wasm-bindgen = "0.2"
 
diff --git a/leptos_dom/src/helpers.rs b/leptos_dom/src/helpers.rs
index 14ed4a4ab..7961829be 100644
--- a/leptos_dom/src/helpers.rs
+++ b/leptos_dom/src/helpers.rs
@@ -4,6 +4,7 @@ use or_poisoned::OrPoisoned;
 #[cfg(debug_assertions)]
 use reactive_graph::diagnostics::SpecialNonReactiveZone;
 use reactive_graph::owner::Owner;
+use send_wrapper::SendWrapper;
 use std::time::Duration;
 use tachys::html::event::EventDescriptor;
 #[cfg(feature = "tracing")]
@@ -468,6 +469,7 @@ pub fn window_event_listener_untyped(
                 cb.unchecked_ref(),
             );
             let event_name = event_name.to_string();
+            let cb = SendWrapper::new(cb);
             WindowListenerHandle(Box::new(move || {
                 _ = window().remove_event_listener_with_callback(
                     &event_name,
@@ -511,7 +513,7 @@ where
 }
 
 /// A handle that can be called to remove a global event listener.
-pub struct WindowListenerHandle(Box<dyn FnOnce()>);
+pub struct WindowListenerHandle(Box<dyn FnOnce() + Send + Sync>);
 
 impl core::fmt::Debug for WindowListenerHandle {
     fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {