diff --git a/sys/amd64/amd64/local_apic.c b/sys/amd64/amd64/local_apic.c
index 740600392a2..3fb31b509b7 100644
--- a/sys/amd64/amd64/local_apic.c
+++ b/sys/amd64/amd64/local_apic.c
@@ -620,6 +620,10 @@ lapic_handle_timer(struct trapframe frame)
 	 *
 	 * No locking is necessary here, since even if we loose the race
 	 * when hlt_cpus_mask changes it is not a big deal, really.
+	 *
+	 * Don't do that for ULE, since ULE doesn't consider hlt_cpus_mask
+	 * and unlike other schedulers it actually schedules threads to
+	 * those CPUs.
 	 */
 	if ((hlt_cpus_mask & (1 << PCPU_GET(cpuid))) != 0)
 		return;
diff --git a/sys/i386/i386/local_apic.c b/sys/i386/i386/local_apic.c
index 0b8d18c2df4..8c9b0858d4d 100644
--- a/sys/i386/i386/local_apic.c
+++ b/sys/i386/i386/local_apic.c
@@ -622,6 +622,10 @@ lapic_handle_timer(struct trapframe frame)
 	 *
 	 * No locking is necessary here, since even if we loose the race
 	 * when hlt_cpus_mask changes it is not a big deal, really.
+	 *
+	 * Don't do that for ULE, since ULE doesn't consider hlt_cpus_mask
+	 * and unlike other schedulers it actually schedules threads to
+	 * those CPUs.
 	 */
 	if ((hlt_cpus_mask & (1 << PCPU_GET(cpuid))) != 0)
 		return;