diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index a91c1e3..4a40054 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -77,7 +77,7 @@ static struct damos_quota damon_lru_sort_quota = {
 };
 DEFINE_DAMON_MODULES_DAMOS_TIME_QUOTA(damon_lru_sort_quota);
 
-struct damos_watermarks damon_lru_sort_wmarks = {
+static struct damos_watermarks damon_lru_sort_wmarks = {
 	.metric = DAMOS_WMARK_FREE_MEM_RATE,
 	.interval = 5000000,	/* 5 seconds */
 	.high = 200,		/* 20 percent */