diff --git a/crates/cli/src/cli.rs b/crates/cli/src/cli.rs
index e647b18..2a20edd 100644
--- a/crates/cli/src/cli.rs
+++ b/crates/cli/src/cli.rs
@@ -243,7 +243,7 @@ pub struct BuildArgs {
     ///
     /// In the format of `current/total`, where 1 <= current <= total.
     #[arg(short = 'P', default_value="1/1", long, value_parser=parse_partitions)]
-    pub partition: Option<Partitions>,
+    pub partition: Partitions,
 }
 
 #[derive(Subcommand)]
diff --git a/crates/cli/src/main.rs b/crates/cli/src/main.rs
index b6dd656..9068616 100644
--- a/crates/cli/src/main.rs
+++ b/crates/cli/src/main.rs
@@ -124,7 +124,7 @@ async fn main() -> Result<()> {
                 should_shutdown.clone(),
                 location,
                 build_args.common,
-                build_args.partition.unwrap_or_default(),
+                build_args.partition,
                 |_name, _node| Goal::Build,
                 modifiers,
                 cache.clone(),