diff --git a/synapse/Cargo.toml b/synapse/Cargo.toml
index 2e7b25c..e626228 100644
--- a/synapse/Cargo.toml
+++ b/synapse/Cargo.toml
@@ -20,6 +20,7 @@ http-body = "0.4.5"
 humantime = "2.1.0"
 humantime-serde = "1.1.1"
 pyo3 = { version = "0.17.2", features = ["extension-module", "abi3-py37", "anyhow"] }
+pyo3-asyncio = "0.17.0"
 pyo3-log = "0.7.0"
 pyo3-matrix-synapse-module = "0.1.1"
 serde = { version = "1.0.145", features = ["derive"] }
diff --git a/synapse/src/lib.rs b/synapse/src/lib.rs
index 80679fd..9f61b97 100644
--- a/synapse/src/lib.rs
+++ b/synapse/src/lib.rs
@@ -76,7 +76,7 @@ impl SynapseRendezvousModule {
             .context("Could not convert max_bytes from config")?;
 
         let sessions = matrix_http_rendezvous::Sessions::new(config.ttl, config.max_entries);
-        tokio::spawn(sessions.eviction_task(Duration::from_secs(60)));
+        pyo3_asyncio::tokio::get_runtime().spawn(sessions.eviction_task(Duration::from_secs(60)));
 
         let service = matrix_http_rendezvous::router(&config.prefix, sessions, max_bytes)
             .map_response(|res| res.map(|b| b.map_err(|e| anyhow!(e))));