diff --git a/NetworkPkg/Application/IpsecConfig/IpSecConfig.h b/NetworkPkg/Application/IpsecConfig/IpSecConfig.h
index 8ebc599a12..79a436a7b3 100644
--- a/NetworkPkg/Application/IpsecConfig/IpSecConfig.h
+++ b/NetworkPkg/Application/IpsecConfig/IpSecConfig.h
@@ -27,7 +27,9 @@
 
 #include <Protocol/IpSecConfig.h>
 
+#ifndef ARRAY_SIZE
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
+#endif
 
 #define IPSECCONFIG_STATUS_NAME    L"IpSecStatus"