diff --git a/pkg/scheduler_plugin/plugin.go b/pkg/scheduler_plugin/plugin.go
index 81eeca8..66d0d0a 100644
--- a/pkg/scheduler_plugin/plugin.go
+++ b/pkg/scheduler_plugin/plugin.go
@@ -211,7 +211,11 @@ func (pl *KubeThrottler) PreFilter(
 	if len(thrInsufficient) != 0 {
 		reasons = append(reasons, fmt.Sprintf("throttle[%s]=%s", schedulev1alpha1.CheckThrottleStatusInsufficient, strings.Join(throttleNames(thrInsufficient), ",")))
 	}
-	return nil, framework.NewStatus(framework.UnschedulableAndUnresolvable, reasons...)
+
+	// TODO(utam0k): Returns a more appropriate type.
+	// If PreFilter returns Unschedulable or UnschedulableAndUnresolvable, preemption will occur.
+	// ref: https://github.com/kubernetes/kubernetes/blob/8a9b209cb11943f4d53a0d840b55cf92ebfbe004/pkg/scheduler/schedule_one.go#L452-L468
+	return nil, framework.NewStatus(framework.Error, reasons...)
 }
 
 func (pl *KubeThrottler) Reserve(