diff --git a/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go b/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
index 711b54bf37d..b096f93ed14 100644
--- a/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
+++ b/pkg/scheduler/framework/plugins/defaultpreemption/default_preemption.go
@@ -127,7 +127,7 @@ func (pl *DefaultPreemption) GetOffsetAndNumCandidates(numNodes int32) (int32, i
 // This function is not applicable for out-of-tree preemption plugins that exercise
 // different preemption candidates on the same nominated node.
 func (pl *DefaultPreemption) CandidatesToVictimsMap(candidates []preemption.Candidate) map[string]*extenderv1.Victims {
-	m := make(map[string]*extenderv1.Victims)
+	m := make(map[string]*extenderv1.Victims, len(candidates))
 	for _, c := range candidates {
 		m[c.Name()] = c.Victims()
 	}