diff --git a/Cargo.toml b/Cargo.toml
index d9ffcb09..920b272f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -140,7 +140,7 @@ web-sys = { version = "0.3.55", features = [
 
 # Orbital dependencies.
 [target.'cfg(target_os = "redox")'.dependencies]
-redox_syscall = "0.7"
+redox_syscall = "0.9"
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/src/backends/kms.rs b/src/backends/kms.rs
index e82770c2..9f6d8f81 100644
--- a/src/backends/kms.rs
+++ b/src/backends/kms.rs
@@ -429,7 +429,7 @@ impl SharedBuffer {
         let (width, height) = self.db.size();
 
         NonZeroU32::new(width)
-            .and_then(|width| NonZeroU32::new(height).map(|height| (width, height)))
+            .zip(NonZeroU32::new(height))
             .expect("buffer size is zero")
     }
 }