diff --git a/ostool-server/src/api/router.rs b/ostool-server/src/api/router.rs
index 32109db..bc18a84 100644
--- a/ostool-server/src/api/router.rs
+++ b/ostool-server/src/api/router.rs
@@ -303,7 +303,7 @@ async fn create_dtb(
     request: Request,
 ) -> Result<(StatusCode, axum::Json<DtbFileResponse>), ApiError> {
     let headers = request.headers();
-    let dtb_name = dtb_name_header(&headers, "X-Dtb-Name")?;
+    let dtb_name = dtb_name_header(headers, "X-Dtb-Name")?;
     let body = read_limited_body(request, DTB_UPLOAD_MAX_MIB, "DTB").await?;
     if body.is_empty() {
         return Err(ApiError::bad_request("DTB upload body must not be empty"));
diff --git a/ostool/src/build/mod.rs b/ostool/src/build/mod.rs
index f4aef37..8224878 100644
--- a/ostool/src/build/mod.rs
+++ b/ostool/src/build/mod.rs
@@ -68,9 +68,19 @@ pub struct CargoUbootRunnerArgs {
 /// either through QEMU emulation or via U-Boot on real hardware.
 pub enum CargoRunnerKind {
     /// Run the built artifact in QEMU emulator.
-    Qemu(CargoQemuRunnerArgs),
+    Qemu(Box<CargoQemuRunnerArgs>),
     /// Run the built artifact on real hardware via U-Boot.
-    Uboot(CargoUbootRunnerArgs),
+    Uboot(Box<CargoUbootRunnerArgs>),
+}
+
+impl CargoRunnerKind {
+    pub fn new_qemu(args: CargoQemuRunnerArgs) -> Self {
+        Self::Qemu(Box::new(args))
+    }
+
+    pub fn new_uboot(args: CargoUbootRunnerArgs) -> Self {
+        Self::Uboot(Box::new(args))
+    }
 }
 
 impl Tool {
diff --git a/ostool/src/main.rs b/ostool/src/main.rs
index 48108be..9504e29 100644
--- a/ostool/src/main.rs
+++ b/ostool/src/main.rs
@@ -218,13 +218,13 @@ async fn try_main() -> Result<()> {
                             ),
                             None => None,
                         };
-                        let kind = CargoRunnerKind::Qemu(CargoQemuRunnerArgs {
+                        let kind = CargoRunnerKind::new_qemu(CargoQemuRunnerArgs {
                             qemu: qemu_config,
                             debug,
                             dtb_dump,
                             show_output: true,
                         });
-                        tool.cargo_run(&config, &kind).await?;
+                        tool.cargo_run(config, &kind).await?;
                     }
                     build::config::BuildSystem::Custom(custom_cfg) => {
                         tool.build_with_config(&build_config).await?;
@@ -262,11 +262,11 @@ async fn try_main() -> Result<()> {
                             ),
                             None => None,
                         };
-                        let kind = CargoRunnerKind::Uboot(CargoUbootRunnerArgs {
+                        let kind = CargoRunnerKind::new_uboot(CargoUbootRunnerArgs {
                             uboot: uboot_config,
                             show_output: true,
                         });
-                        tool.cargo_run(&config, &kind).await?;
+                        tool.cargo_run(config, &kind).await?;
                     }
                     build::config::BuildSystem::Custom(custom_cfg) => {
                         tool.build_with_config(&build_config).await?;
diff --git a/ostool/tests/ui/pass_tool_configs.rs b/ostool/tests/ui/pass_tool_configs.rs
index f6973c5..fbe98c0 100644
--- a/ostool/tests/ui/pass_tool_configs.rs
+++ b/ostool/tests/ui/pass_tool_configs.rs
@@ -18,13 +18,13 @@ fn main() {
     let _ = RunQemuOptions::default();
     let _ = RunUbootOptions::default();
     let _ = board::RunBoardOptions::default();
-    let _ = build::CargoRunnerKind::Qemu(build::CargoQemuRunnerArgs {
+    let _ = build::CargoRunnerKind::new_qemu(build::CargoQemuRunnerArgs {
         qemu: Some(qemu),
         debug: false,
         dtb_dump: false,
         show_output: true,
     });
-    let _ = build::CargoRunnerKind::Uboot(build::CargoUbootRunnerArgs {
+    let _ = build::CargoRunnerKind::new_uboot(build::CargoUbootRunnerArgs {
         uboot: Some(uboot),
         show_output: true,
     });