diff --git a/.travis.yml b/.travis.yml
index 5a15187c4..cb734fa3c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: rust
-rust: nightly-2019-05-09
+rust: nightly-2019-06-02
 cache: cargo
 
 before_script:
diff --git a/tide-cookies/src/middleware.rs b/tide-cookies/src/middleware.rs
index 41c3e10db..4d6b85aee 100644
--- a/tide-cookies/src/middleware.rs
+++ b/tide-cookies/src/middleware.rs
@@ -44,7 +44,9 @@ impl<State: Send + Sync + 'static> Middleware<State> for CookiesMiddleware {
 
             let cookie_jar = cookie_data.content.clone();
 
-            cx.extensions_mut().insert(cookie_data);
+            // The `let _ = ...` is a workaround for issue: https://github.com/rustasync/tide/issues/278
+            // Solution is according to suggestion in https://github.com/rust-lang/rust/issues/61579#issuecomment-500436524
+            let _ = cx.extensions_mut().insert(cookie_data);
             let mut res = next.run(cx).await;
             let headers = res.headers_mut();
             for cookie in cookie_jar.read().unwrap().delta() {