diff --git a/mm/damon/core.c b/mm/damon/core.c
index be5942435d78..ff2c6bb30621 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2261,6 +2261,8 @@ static void damon_merge_regions_of(struct damon_target *t, unsigned int thres,
 	damon_for_each_region_safe(r, next, t) {
 		if (abs(r->nr_accesses - r->last_nr_accesses) > thres)
 			r->age = 0;
+		else if ((r->nr_accesses == 0) != (r->last_nr_accesses == 0))
+			r->age = 0;
 		else
 			r->age++;