diff --git a/orchagent/p4orch/tests/fake_notificationconsumer.cpp b/orchagent/p4orch/tests/fake_notificationconsumer.cpp
index d0c88a59fec..cdd4591a2fd 100644
--- a/orchagent/p4orch/tests/fake_notificationconsumer.cpp
+++ b/orchagent/p4orch/tests/fake_notificationconsumer.cpp
@@ -5,7 +5,7 @@ namespace swss
 
 NotificationConsumer::NotificationConsumer(swss::DBConnector *db, const std::string &channel, int pri,
                                            size_t popBatchSize)
-    : Selectable(pri), POP_BATCH_SIZE(popBatchSize), m_db(db), m_subscribe(NULL), m_channel(channel),
+    : Selectable(pri), POP_BATCH_SIZE(popBatchSize), m_db(db), m_subscribe(nullptr), m_channel(channel),
       m_queue(std::make_unique<FifoNotificationQueue>())
 {
     SWSS_LOG_ENTER();
@@ -13,7 +13,7 @@ NotificationConsumer::NotificationConsumer(swss::DBConnector *db, const std::str
 
 NotificationConsumer::NotificationConsumer(swss::DBConnector *db, const std::string &channel, int pri,
                                            size_t popBatchSize, NotificationQueuePolicy policy)
-    : Selectable(pri), POP_BATCH_SIZE(popBatchSize), m_db(db), m_subscribe(NULL), m_channel(channel),
+    : Selectable(pri), POP_BATCH_SIZE(popBatchSize), m_db(db), m_subscribe(nullptr), m_channel(channel),
       m_queue(policy == NotificationQueuePolicy::LruDedup
               ? std::unique_ptr<NotificationQueueBase>(std::make_unique<LruDedupNotificationQueue>(channel))
               : std::unique_ptr<NotificationQueueBase>(std::make_unique<FifoNotificationQueue>()))