diff --git a/{{project-name}}/src/main.rs b/{{project-name}}/src/main.rs
index 2d7eccd..3b83182 100644
--- a/{{project-name}}/src/main.rs
+++ b/{{project-name}}/src/main.rs
@@ -65,7 +65,7 @@ struct Opt {
     cgroup_path: std::path::PathBuf,
 {%- when "uprobe", "uretprobe" %}
     #[clap(short, long)]
-    pid: Option<i32>,
+    pid: Option<u32>,
 {%- endcase %}
 }