diff --git a/Cargo.lock b/Cargo.lock
index f64a6534..b6a54500 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3723,7 +3723,7 @@ dependencies = [
 
 [[package]]
 name = "wrpc-runtime-wasmtime"
-version = "0.17.3"
+version = "0.17.4"
 dependencies = [
  "anyhow",
  "bytes",
diff --git a/crates/runtime-wasmtime/Cargo.toml b/crates/runtime-wasmtime/Cargo.toml
index 36b42651..af27313a 100644
--- a/crates/runtime-wasmtime/Cargo.toml
+++ b/crates/runtime-wasmtime/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "wrpc-runtime-wasmtime"
-version = "0.17.3"
+version = "0.17.4"
 description = "wRPC wasmtime integration"
 
 authors.workspace = true
diff --git a/crates/runtime-wasmtime/src/lib.rs b/crates/runtime-wasmtime/src/lib.rs
index 020efeb6..96a181ee 100644
--- a/crates/runtime-wasmtime/src/lib.rs
+++ b/crates/runtime-wasmtime/src/lib.rs
@@ -14,6 +14,7 @@ use futures::future::try_join_all;
 use futures::stream::FuturesUnordered;
 use futures::{Stream, TryStreamExt as _};
 use tokio::io::{AsyncRead, AsyncReadExt as _, AsyncWrite, AsyncWriteExt as _};
+use tokio::sync::Mutex;
 use tokio::try_join;
 use tokio_util::codec::{Encoder, FramedRead};
 use tokio_util::compat::FuturesAsyncReadCompatExt as _;
@@ -991,7 +992,7 @@ where
 pub trait ServeExt: wrpc_transport::Serve {
     fn serve_function<T>(
         &self,
-        store: impl AsContextMut<Data = T> + Send + Clone + 'static,
+        store: impl Into<Arc<Mutex<wasmtime::Store<T>>>>,
         func: Func,
         instance: &str,
         name: &str,
@@ -1001,26 +1002,32 @@ pub trait ServeExt: wrpc_transport::Serve {
     where
         T: WasiView + 'static,
     {
+        let store = store.into();
         async move {
-            let params_ty: Arc<[_]> = Arc::from(func.params(&store));
-            let results_ty: Arc<[_]> = Arc::from(func.results(&store));
+            let (params_ty, results_ty): (Arc<[_]>, Arc<[_]>) = {
+                let store = store.lock().await;
+                (
+                    Arc::from(func.params(&*store)),
+                    Arc::from(func.results(&*store)),
+                )
+            };
             // TODO: set paths
             let invocations = self.serve(instance, name, []).await?;
-
             Ok(invocations.and_then(move |(cx, mut tx, rx)| {
-                let mut store = store.clone();
+                let store = store.clone();
                 let params_ty = Arc::clone(&params_ty);
                 let results_ty = Arc::clone(&results_ty);
                 async move {
+                    let mut store = store.lock().await;
                     let mut params = vec![Val::Bool(false); params_ty.len()];
                     let mut rx = pin!(rx);
                     for (i, (v, ty)) in zip(&mut params, params_ty.iter()).enumerate() {
-                        read_value(&mut store, &mut rx, v, ty, &[i])
+                        read_value(&mut *store, &mut rx, v, ty, &[i])
                             .await
                             .with_context(|| format!("failed to decode parameter value {i}"))?;
                     }
                     let mut results = vec![Val::Bool(false); results_ty.len()];
-                    func.call_async(&mut store, &params, &mut results)
+                    func.call_async(&mut *store, &params, &mut results)
                         .await
                         .context("failed to call function")?;
                     let mut buf = BytesMut::default();
@@ -1047,7 +1054,7 @@ pub trait ServeExt: wrpc_transport::Serve {
                             }),
                     )
                     .await?;
-                    func.post_return_async(&mut store)
+                    func.post_return_async(&mut *store)
                         .await
                         .context("failed to perform post-return cleanup")?;
                     Ok(cx)
@@ -1058,3 +1065,24 @@ pub trait ServeExt: wrpc_transport::Serve {
 }
 
 impl<T: wrpc_transport::Serve> ServeExt for T {}
+
+#[cfg(test)]
+mod tests {
+    use tokio::sync::Mutex;
+
+    use super::*;
+
+    #[allow(unused)]
+    async fn serve_function<T: WasiView + 'static>(
+        srv: impl wrpc_transport::Serve,
+        store: wasmtime::Store<T>,
+        func: Func,
+    ) {
+        srv.serve_function(Mutex::new(store), func, "foo", "bar")
+            .await
+            .unwrap()
+            .try_for_each(|_| async { Ok(()) })
+            .await
+            .unwrap()
+    }
+}