diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 1789193d9917..ba97d1a1b976 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -229,8 +229,7 @@ static u64 __calc_delta(u64 delta_exec, unsigned long weight, struct load_weight
 		}
 	}
 
-	/* hint to use a 32x32->64 mul */
-	fact = (u64)(u32)fact * lw->inv_weight;
+	fact = mul_u32_u32(fact, lw->inv_weight);
 
 	while (fact >> 32) {
 		fact >>= 1;