diff --git a/Kernel/Syscalls/thread.cpp b/Kernel/Syscalls/thread.cpp
index 46e120a74ac..72c2ca23549 100644
--- a/Kernel/Syscalls/thread.cpp
+++ b/Kernel/Syscalls/thread.cpp
@@ -187,7 +187,7 @@ ErrorOr<FlatPtr> Process::sys$set_thread_name(pid_t tid, Userspace<char const*>
 
     const size_t max_thread_name_size = 64;
     if (name->length() > max_thread_name_size)
-        return EINVAL;
+        return ENAMETOOLONG;
 
     auto thread = Thread::from_tid(tid);
     if (!thread || thread->pid() != pid())