diff --git a/kernel/core_hook.c b/kernel/core_hook.c
index 1288de69..5b8f6fc2 100644
--- a/kernel/core_hook.c
+++ b/kernel/core_hook.c
@@ -521,7 +521,7 @@ static bool should_umount(struct path *path)
 
 static void ksu_umount_mnt(struct path *path, int flags)
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0) || KSU_UMOUNT
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0) || defined(KSU_UMOUNT)
 	int err = path_umount(path, flags);
 	if (err) {
 		pr_info("umount %s failed: %d\n", path->dentry->d_iname, err);