diff --git a/kernel/arch/x86_64/SpinLock.S b/kernel/arch/x86_64/SpinLock.S
index 4ab72a3d..ad27179b 100644
--- a/kernel/arch/x86_64/SpinLock.S
+++ b/kernel/arch/x86_64/SpinLock.S
@@ -13,5 +13,5 @@ spinlock_lock_asm:
 
 .global spinlock_unlock_asm
 spinlock_unlock_asm:
-	movq $0, (%rdi)
+	movl $0, (%rdi)
 	ret
\ No newline at end of file