diff --git a/src/kernel/exception.rs b/src/kernel/exception.rs
index 749a9bc..89f7cdb 100644
--- a/src/kernel/exception.rs
+++ b/src/kernel/exception.rs
@@ -1,7 +1,7 @@
 use std::{cell::RefCell, rc::Rc};
 
 use crate::{simulator::{machine::{ExceptionType, Machine}, error::{MachineOk, MachineError}}};
-use crate::kernel::synch::Semaphore;
+use crate::kernel::synch::{Lock, Semaphore};
 
 use super::{system::System, thread::Thread};
 
@@ -215,7 +215,8 @@ fn sc_sem_create(machine: &mut Machine, system: &mut System) -> Result<MachineOk
     match initial_count < 0 {
         true => Err(format!("Initial_count < 0"))?,
         false => {
-            system.get_thread_manager().get_obj_addrs().add_semaphore(Semaphore::new(initial_count));
+            let id = system.get_thread_manager().get_obj_addrs().add_semaphore(Semaphore::new(initial_count));
+            machine.write_int_register(10, id as i64);
             Ok(MachineOk::Ok)
         }
     }