diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
index 77366f42b3e5..7a7429359dc8 100644
--- a/mm/damon/ops-common.c
+++ b/mm/damon/ops-common.c
@@ -164,7 +164,7 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
 			struct damos *s)
 {
 	int freq_subscore;
-	unsigned int age_in_sec;
+	u64 age_in_sec;
 	int age_in_log, age_subscore;
 	unsigned int freq_weight = s->quota.weight_nr_accesses;
 	unsigned int age_weight = s->quota.weight_age;
@@ -174,7 +174,8 @@ int damon_hot_score(struct damon_ctx *c, struct damon_region *r,
 			DAMON_MAX_SUBSCORE,
 			damon_nr_samples_per_aggr(&c->attrs));
 
-	age_in_sec = (unsigned long)r->age * c->attrs.aggr_interval / 1000000;
+	age_in_sec = div_u64((u64)r->age * c->attrs.aggr_interval,
+			     USEC_PER_SEC);
 	if (age_in_sec)
 		age_in_log = min_t(int, ilog2(age_in_sec) + 1,
 				DAMON_MAX_AGE_IN_LOG);