diff --git a/ethernet_interface.cpp b/ethernet_interface.cpp
index 607e658..2de60e4 100644
--- a/ethernet_interface.cpp
+++ b/ethernet_interface.cpp
@@ -122,7 +122,7 @@
     EthernetInterfaceIntf::linkUp(linkUp());
     EthernetInterfaceIntf::nicEnabled(nicEnabled());
 
-#if NIC_SUPPORTS_ETHTOOL
+#ifdef NIC_SUPPORTS_ETHTOOL
     InterfaceInfo ifInfo = EthernetInterface::getInterfaceInfo();
 
     EthernetInterfaceIntf::autoNeg(std::get<2>(ifInfo));
@@ -348,7 +348,7 @@
     return objectPath;
 }
 
-#if NIC_SUPPORTS_ETHTOOL
+#ifdef NIC_SUPPORTS_ETHTOOL
 /*
   Enable this code if your NIC driver supports the ETHTOOL features.
   Do this by adding the following to your phosphor-network*.bbappend file.
diff --git a/network_manager.cpp b/network_manager.cpp
index 881b767..751d1a1 100644
--- a/network_manager.cpp
+++ b/network_manager.cpp
@@ -210,7 +210,7 @@
     restartTimers();
 }
 
-#if SYNC_MAC_FROM_INVENTORY
+#ifdef SYNC_MAC_FROM_INVENTORY
 void Manager::setFistBootMACOnInterface(
     const std::pair<std::string, std::string>& inventoryEthPair)
 {
diff --git a/network_manager_main.cpp b/network_manager_main.cpp
index 734a48a..38fe673 100644
--- a/network_manager_main.cpp
+++ b/network_manager_main.cpp
@@ -48,7 +48,7 @@
 std::unique_ptr<Timer> refreshObjectTimer = nullptr;
 std::unique_ptr<Timer> restartTimer = nullptr;
 
-#if SYNC_MAC_FROM_INVENTORY
+#ifdef SYNC_MAC_FROM_INVENTORY
 std::unique_ptr<sdbusplus::bus::match::match> EthInterfaceMatch = nullptr;
 std::vector<std::string> first_boot_status;
 
@@ -330,7 +330,7 @@
     // RTNETLINK event handler
     phosphor::network::rtnetlink::Server svr(eventPtr, smartSock);
 
-#if SYNC_MAC_FROM_INVENTORY
+#ifdef SYNC_MAC_FROM_INVENTORY
     std::ifstream in(configFile);
     nlohmann::json configJson;
     in >> configJson;
diff --git a/util.cpp b/util.cpp
index 5e1c92b..34df649 100644
--- a/util.cpp
+++ b/util.cpp
@@ -543,7 +543,7 @@
 
     std::string interfaceName = intfName;
 
-#if SYNC_MAC_FROM_INVENTORY
+#ifdef SYNC_MAC_FROM_INVENTORY
     // load the config JSON from the Read Only Path
     std::ifstream in(configFile);
     nlohmann::json configJson;