diff --git a/Kernel/Syscalls/fork.cpp b/Kernel/Syscalls/fork.cpp
index 5183448a0d..833a68771b 100644
--- a/Kernel/Syscalls/fork.cpp
+++ b/Kernel/Syscalls/fork.cpp
@@ -18,6 +18,15 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
     VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
     TRY(require_promise(Pledge::proc));
     RefPtr<Thread> child_first_thread;
+
+    ArmedScopeGuard thread_finalizer_guard = [&child_first_thread]() {
+        SpinlockLocker lock(g_scheduler_lock);
+        if (child_first_thread) {
+            child_first_thread->detach();
+            child_first_thread->set_state(Thread::State::Dying);
+        }
+    };
+
     auto child_name = TRY(m_name->try_clone());
     auto child = TRY(Process::try_create(child_first_thread, move(child_name), uid(), gid(), pid(), m_is_kernel_process, current_directory(), m_executable, m_tty, this));
     TRY(m_unveil_data.with([&](auto& parent_unveil_data) -> ErrorOr<void> {
@@ -120,6 +129,8 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
         }
     }
 
+    thread_finalizer_guard.disarm();
+
     Process::register_new(*child);
 
     PerformanceManager::add_process_created_event(*child);