diff --git a/src/lib.rs b/src/lib.rs
index 65340e2e..e9dee9ed 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -864,6 +864,11 @@ impl InnerConnection {
     }
 }
 
+fn _ensure_send() {
+    fn _is_send<T: Send>() {}
+    _is_send::<Connection>();
+}
+
 /// A connection to a Postgres database.
 pub struct Connection {
     conn: RefCell<InnerConnection>