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)
 {