diff --git a/Kernel/Thread.cpp b/Kernel/Thread.cpp
index 01842b06b4..f9044109f4 100644
--- a/Kernel/Thread.cpp
+++ b/Kernel/Thread.cpp
@@ -220,7 +220,7 @@ void Thread::relock_process(bool did_unlock)
         process().big_lock().lock();
 }
 
-u64 Thread::sleep(u32 ticks)
+u64 Thread::sleep(u64 ticks)
 {
     ASSERT(state() == Thread::Running);
     u64 wakeup_time = g_uptime + ticks;
diff --git a/Kernel/Thread.h b/Kernel/Thread.h
index 50ffe54a1a..138867d694 100644
--- a/Kernel/Thread.h
+++ b/Kernel/Thread.h
@@ -297,7 +297,7 @@ public:
     VirtualAddress thread_specific_data() const { return m_thread_specific_data; }
     size_t thread_specific_region_size() const { return m_thread_specific_region_size; }
 
-    u64 sleep(u32 ticks);
+    u64 sleep(u64 ticks);
     u64 sleep_until(u64 wakeup_time);
 
     class BlockResult {