diff --git a/build.rs b/build.rs
index ed2d657..b94570e 100644
--- a/build.rs
+++ b/build.rs
@@ -31,6 +31,7 @@ fn main() -> std::io::Result<()> {
         }
     }
 
+    println!("cargo:rustc-env=TARGET={}", env::var("TARGET").unwrap());
     println!("cargo:rerun-if-env-changed={ENV_KEY}");
 
     Ok(())
diff --git a/src/api.rs b/src/api.rs
index 020469a..adc3643 100644
--- a/src/api.rs
+++ b/src/api.rs
@@ -95,7 +95,12 @@ fn get_username() -> String {
 }
 
 fn build_user_agent() -> String {
-    let ua = concat!("asciinema/", env!("CARGO_PKG_VERSION")); // TODO add more system info
+    let ua = concat!(
+        "asciinema/",
+        env!("CARGO_PKG_VERSION"),
+        " target/",
+        env!("TARGET")
+    );
 
     ua.to_owned()
 }