diff --git a/src/bin/izoli.rs b/src/bin/izoli.rs
index 5103fc3..2f57ed4 100644
--- a/src/bin/izoli.rs
+++ b/src/bin/izoli.rs
@@ -40,9 +40,6 @@ fn main() {
 
     let pid = izolibox
         .enter(Box::new(|| {
-            IzoliBox::prelude(1).unwrap();
-            println!("Isolated process: {}", std::process::id());
-
             let cmd = CString::new("/usr/bin/bash").unwrap();
             let args: Vec<CString> = vec![];
             if let Err(e) = execvp(&cmd, &args.as_ref()) {
diff --git a/src/izolibox.rs b/src/izolibox.rs
index c94e3af..2b8a601 100644
--- a/src/izolibox.rs
+++ b/src/izolibox.rs
@@ -46,7 +46,16 @@ impl IzoliBox {
             cgroup.enter().unwrap();
         }
 
-        unsafe { sched::clone(callback, &mut stack, flags, Some(SIGCHLD)) }
+        let mut callback = callback;
+        let new_callback = Box::new(|| {
+            IzoliBox::prelude(self.id).unwrap();
+
+            callback();
+
+            127
+        });
+
+        unsafe { sched::clone(new_callback, &mut stack, flags, Some(SIGCHLD)) }
     }
 
     pub fn prelude(id: usize) -> Result<(), Box<dyn std::error::Error>> {