diff --git a/src/main.rs b/src/main.rs
index 4aed41c..8acf939 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -70,13 +70,13 @@ mod jni {
     }
 
     impl<'env: 'borrow, 'borrow> FridaLib<'env, 'borrow> {
-        pub extern "jni" fn start(self, env: &JNIEnv, config_b32: JString,
-            tun_fd: jint,
-            close_fd_on_drop: jboolean) -> jint {
+        pub extern "jni" fn start(self, env: &JNIEnv, config_b32: String,
+            tun_fd: i32,
+            close_fd_on_drop: bool) -> jint {
             android_logger::init_once(Config::default().with_tag("RUST_FRIDA"));
 
            
-            info!("Hello world!");
+            info!("Hello world! {:?}", tun_fd);
 
            
         }