diff --git a/kernel/sched/tune.c b/kernel/sched/tune.c
index c4b611424376..7c9e617bfa7f 100644
--- a/kernel/sched/tune.c
+++ b/kernel/sched/tune.c
@@ -67,7 +67,7 @@ root_schedtune = {
  *    implementation especially for the computation of the per-CPU boost
  *    value
  */
-#define BOOSTGROUPS_COUNT 4
+#define BOOSTGROUPS_COUNT 5
 
 /* Array of configured boostgroups */
 static struct schedtune *allocated_group[BOOSTGROUPS_COUNT] = {