diff --git a/pkg/scheduler/internal/queue/scheduling_queue.go b/pkg/scheduler/internal/queue/scheduling_queue.go
index e3382ba1c65..db3d19ab310 100644
--- a/pkg/scheduler/internal/queue/scheduling_queue.go
+++ b/pkg/scheduler/internal/queue/scheduling_queue.go
@@ -772,7 +772,16 @@ func (npm *nominatedPodMap) delete(p *v1.Pod) {
 }
 
 func (npm *nominatedPodMap) update(oldPod, newPod *v1.Pod) {
-	// We update irrespective of the nominatedNodeName changed or not, to ensure
+	// In some cases, an Update event with no "NominatedNode" present is received right
+	// after a node("NominatedNode") is reserved for this pod in memory.
+	// If we go updating (delete and add) it, it actually un-reserves the node since
+	// the newPod doesn't carry Status.NominatedNodeName.
+	// In this case, during this time other low-priority pods have chances to take space which
+	// was reserved for the nominatedPod.
+	if len(oldPod.Status.NominatedNodeName) == 0 && len(newPod.Status.NominatedNodeName) == 0 {
+		return
+	}
+	// We update once the nominatedNodeName gets changed, to ensure
 	// that pod pointer is updated.
 	npm.delete(oldPod)
 	npm.add(newPod, "")