diff --git a/kernel/include/kernel/Scheduler.h b/kernel/include/kernel/Scheduler.h
index f22114ea..02b72b74 100644
--- a/kernel/include/kernel/Scheduler.h
+++ b/kernel/include/kernel/Scheduler.h
@@ -29,8 +29,6 @@ namespace Kernel
 		Thread& current_thread();
 		static pid_t current_tid();
 
-		static bool is_valid_tid(pid_t tid);
-
 		[[noreturn]] void execute_current_thread();
 		[[noreturn]] void _execute_current_thread();
 		[[noreturn]] void delete_current_process_and_thread();
diff --git a/kernel/kernel/Scheduler.cpp b/kernel/kernel/Scheduler.cpp
index 5bd5e1ea..bd5ebdc6 100644
--- a/kernel/kernel/Scheduler.cpp
+++ b/kernel/kernel/Scheduler.cpp
@@ -378,26 +378,4 @@ namespace Kernel
 		}
 	}
 
-	bool Scheduler::is_valid_tid(pid_t tid)
-	{
-		CriticalScope _;
-
-		if (s_instance == nullptr)
-			return tid == 0;
-
-		for (auto& thread : s_instance->m_active_threads)
-			if (thread.thread->tid() == tid)
-				return true;
-		
-		for (auto& thread : s_instance->m_sleeping_threads)
-			if (thread.thread->tid() == tid)
-				return true;
-
-		for (auto& thread : s_instance->m_blocking_threads)
-			if (thread.thread->tid() == tid)
-				return true;
-
-		return false;
-	}
-
-}
\ No newline at end of file
+}
diff --git a/kernel/kernel/SpinLock.cpp b/kernel/kernel/SpinLock.cpp
index f5eb66cf..7f9964ab 100644
--- a/kernel/kernel/SpinLock.cpp
+++ b/kernel/kernel/SpinLock.cpp
@@ -13,7 +13,7 @@ namespace Kernel
 			{
 				CriticalScope _;
 				ASSERT(m_locker != tid);
-				if (m_locker == -1 || !Scheduler::is_valid_tid(m_locker))
+				if (m_locker == -1)
 				{
 					m_locker = tid;
 					break;
@@ -48,7 +48,7 @@ namespace Kernel
 				m_lock_depth++;
 				break;
 			}
-			if (m_locker == -1 || !Scheduler::is_valid_tid(m_locker))
+			if (m_locker == -1)
 			{
 				m_locker = tid;
 				m_lock_depth = 1;