diff --git a/Cargo.toml b/Cargo.toml
index 267f39523ac..1408ece7320 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,7 +32,7 @@ version = "0.2"
 objc = "0.2.3"
 
 [target.'cfg(target_os = "macos")'.dependencies]
-cocoa = "0.18.4"
+cocoa = "0.19.1"
 core-foundation = "0.6"
 core-graphics = "0.17.3"
 dispatch = "0.1.4"
diff --git a/src/platform_impl/macos/window.rs b/src/platform_impl/macos/window.rs
index 4c9e3f9b32e..ab19fe7a678 100644
--- a/src/platform_impl/macos/window.rs
+++ b/src/platform_impl/macos/window.rs
@@ -786,7 +786,7 @@ impl UnownedWindow {
                 // of the menu bar, and this looks broken, so we must make sure
                 // that the menu bar is disabled. This is done in the window
                 // delegate in `window:willUseFullScreenPresentationOptions:`.
-                msg_send![*self.ns_window, setLevel: ffi::CGShieldingWindowLevel() + 1];
+                let () = msg_send![*self.ns_window, setLevel: ffi::CGShieldingWindowLevel() + 1];
             },
             (
                 &Some(Fullscreen::Exclusive(RootVideoMode { ref video_mode })),