diff --git a/src-tauri/src/browser_runner.rs b/src-tauri/src/browser_runner.rs
index 3bc993a..b097ce3 100644
--- a/src-tauri/src/browser_runner.rs
+++ b/src-tauri/src/browser_runner.rs
@@ -83,6 +83,7 @@ impl BrowserRunner {
   }
 
   // Helper function to validate PID for TOR/Mullvad browsers
+  #[cfg(target_os = "macos")]
   fn validate_tor_mullvad_pid(&self, profile: &BrowserProfile, pid: u32) -> bool {
     let system = System::new_all();