diff --git a/src/system/kernel/scheduler/scheduler_affine.cpp b/src/system/kernel/scheduler/scheduler_affine.cpp
index b50480390f..6045e15f7a 100644
--- a/src/system/kernel/scheduler/scheduler_affine.cpp
+++ b/src/system/kernel/scheduler/scheduler_affine.cpp
@@ -500,9 +500,10 @@ affine_reschedule(void)
 			&& nextThread->priority < B_NORMAL_PRIORITY)
 			quantum = kMaxThreadQuantum;
 
-		if (!thread_is_idle_thread(nextThread))
+		if (!thread_is_idle_thread(nextThread)) {
 			add_timer(quantumTimer, &reschedule_event, quantum,
 				B_ONE_SHOT_RELATIVE_TIMER | B_TIMER_ACQUIRE_SCHEDULER_LOCK);
+		}
 
 		if (nextThread != oldThread)
 			scheduler_switch_thread(oldThread, nextThread);
diff --git a/src/system/kernel/scheduler/scheduler_simple.cpp b/src/system/kernel/scheduler/scheduler_simple.cpp
index 42e69199a1..4898781cdf 100644
--- a/src/system/kernel/scheduler/scheduler_simple.cpp
+++ b/src/system/kernel/scheduler/scheduler_simple.cpp
@@ -324,9 +324,10 @@ simple_reschedule(void)
 			cancel_timer(quantumTimer);
 
 		oldThread->cpu->preempted = 0;
-		if (!thread_is_idle_thread(nextThread))
+		if (!thread_is_idle_thread(nextThread)) {
 			add_timer(quantumTimer, &reschedule_event, quantum,
 				B_ONE_SHOT_RELATIVE_TIMER | B_TIMER_ACQUIRE_SCHEDULER_LOCK);
+		}
 
 		if (nextThread != oldThread)
 			scheduler_switch_thread(oldThread, nextThread);
diff --git a/src/system/kernel/scheduler/scheduler_simple_smp.cpp b/src/system/kernel/scheduler/scheduler_simple_smp.cpp
index ff3e3d2ac1..32dd4e2d59 100644
--- a/src/system/kernel/scheduler/scheduler_simple_smp.cpp
+++ b/src/system/kernel/scheduler/scheduler_simple_smp.cpp
@@ -423,9 +423,10 @@ reschedule(void)
 			cancel_timer(quantumTimer);
 
 		oldThread->cpu->preempted = 0;
-		if (!thread_is_idle_thread(nextThread))
+		if (!thread_is_idle_thread(nextThread)) {
 			add_timer(quantumTimer, &reschedule_event, quantum,
 				B_ONE_SHOT_RELATIVE_TIMER | B_TIMER_ACQUIRE_SCHEDULER_LOCK);
+		}
 
 		if (nextThread != oldThread)
 			scheduler_switch_thread(oldThread, nextThread);