diff --git a/kernel/sched.c b/kernel/sched.c
index 78acdefeccca268874f5b43457146043f99debcb..dc599c85a88d1cf683d4d90fd26349d20d34f757 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -145,7 +145,8 @@
 	(v1) * (v2_max) / (v1_max)
 
 #define DELTA(p) \
-	(SCALE(TASK_NICE(p), 40, MAX_BONUS) + INTERACTIVE_DELTA)
+	(SCALE(TASK_NICE(p) + 20, 40, MAX_BONUS) - 20 * MAX_BONUS / 40 + \
+		INTERACTIVE_DELTA)
 
 #define TASK_INTERACTIVE(p) \
 	((p)->prio <= (p)->static_prio - DELTA(p))