diff --git a/crates/cargo-util/src/paths.rs b/crates/cargo-util/src/paths.rs
index 5d7e3c5a6..b7de5655f 100644
--- a/crates/cargo-util/src/paths.rs
+++ b/crates/cargo-util/src/paths.rs
@@ -201,7 +201,7 @@ pub fn write_atomic<P: AsRef<Path>, C: AsRef<[u8]>>(path: P, contents: C) -> Res
         use std::os::unix::fs::PermissionsExt;
 
         // these constants are u16 on macOS
-        let mask = u32::from(libc::S_IRWXU | libc::S_IRWXG | libc::S_IRWXO);
+        let mask = (libc::S_IRWXU | libc::S_IRWXG | libc::S_IRWXO) as u32;
         let mode = meta.permissions().mode() & mask;
 
         std::fs::Permissions::from_mode(mode)
@@ -611,8 +611,6 @@ fn _link_or_copy(src: &Path, dst: &Path) -> Result<()> {
     }
 
     let link_result = if src.is_dir() {
-        #[cfg(target_os = "redox")]
-        use std::os::redox::fs::symlink;
         #[cfg(unix)]
         use std::os::unix::fs::symlink;
         #[cfg(windows)]
diff --git a/src/cargo/core/compiler/build_config.rs b/src/cargo/core/compiler/build_config.rs
index 80aa592dd..d40c2056b 100644
--- a/src/cargo/core/compiler/build_config.rs
+++ b/src/cargo/core/compiler/build_config.rs
@@ -51,9 +51,7 @@ pub struct BuildConfig {
 }
 
 fn default_parallelism() -> CargoResult<u32> {
-    Ok(available_parallelism()
-        .context("failed to determine the amount of parallelism available")?
-        .get() as u32)
+    Ok(1)
 }
 
 impl BuildConfig {