diff --git a/crates/wasi-common/cap-std-sync/Cargo.toml b/crates/wasi-common/cap-std-sync/Cargo.toml
index 821fa8a5bb..e48ede5400 100644
--- a/crates/wasi-common/cap-std-sync/Cargo.toml
+++ b/crates/wasi-common/cap-std-sync/Cargo.toml
@@ -13,6 +13,7 @@ include = ["src/**/*", "LICENSE" ]
 
 [dependencies]
 wasi-common = { path = "../", version = "0.26.0" }
+wiggle = { path = "../../wiggle", version = "0.26.0" }
 anyhow = "1.0"
 cap-std = "0.13.7"
 cap-fs-ext = "0.13.7"
diff --git a/crates/wasi-common/cap-std-sync/src/sched/unix.rs b/crates/wasi-common/cap-std-sync/src/sched/unix.rs
index da2ec1d143..eeb9c9c0a7 100644
--- a/crates/wasi-common/cap-std-sync/src/sched/unix.rs
+++ b/crates/wasi-common/cap-std-sync/src/sched/unix.rs
@@ -21,8 +21,9 @@ impl SyncSched {
     }
 }
 
+#[wiggle::async_trait]
 impl WasiSched for SyncSched {
-    fn poll_oneoff<'a>(&self, poll: &'a Poll<'a>) -> Result<(), Error> {
+    async fn poll_oneoff<'a>(&self, poll: &'_ Poll<'a>) -> Result<(), Error> {
         if poll.is_empty() {
             return Ok(());
         }
@@ -104,11 +105,11 @@ impl WasiSched for SyncSched {
         }
         Ok(())
     }
-    fn sched_yield(&self) -> Result<(), Error> {
+    async fn sched_yield(&self) -> Result<(), Error> {
         std::thread::yield_now();
         Ok(())
     }
-    fn sleep(&self, duration: Duration) -> Result<(), Error> {
+    async fn sleep(&self, duration: Duration) -> Result<(), Error> {
         std::thread::sleep(duration);
         Ok(())
     }
diff --git a/crates/wasi-common/cap-std-sync/src/sched/windows.rs b/crates/wasi-common/cap-std-sync/src/sched/windows.rs
index f40cb08d72..752be626b0 100644
--- a/crates/wasi-common/cap-std-sync/src/sched/windows.rs
+++ b/crates/wasi-common/cap-std-sync/src/sched/windows.rs
@@ -21,8 +21,9 @@ impl SyncSched {
     }
 }
 
+#[wiggle::async_trait]
 impl WasiSched for SyncSched {
-    fn poll_oneoff<'a>(&self, poll: &'a Poll<'a>) -> Result<(), Error> {
+    async fn poll_oneoff<'a>(&self, poll: &'_ Poll<'a>) -> Result<(), Error> {
         if poll.is_empty() {
             return Ok(());
         }
@@ -124,11 +125,11 @@ impl WasiSched for SyncSched {
 
         Ok(())
     }
-    fn sched_yield(&self) -> Result<(), Error> {
+    async fn sched_yield(&self) -> Result<(), Error> {
         thread::yield_now();
         Ok(())
     }
-    fn sleep(&self, duration: Duration) -> Result<(), Error> {
+    async fn sleep(&self, duration: Duration) -> Result<(), Error> {
         std::thread::sleep(duration);
         Ok(())
     }