diff --git a/OvmfPkg/XenBusDxe/XenStore.c b/OvmfPkg/XenBusDxe/XenStore.c
index 9eeb6f54fb..1666c4b8f9 100644
--- a/OvmfPkg/XenBusDxe/XenStore.c
+++ b/OvmfPkg/XenBusDxe/XenStore.c
@@ -713,9 +713,6 @@ static XenStoreErrors gXenStoreErrors[] = {
   { XENSTORE_STATUS_EISCONN, "EISCONN" },
   { XENSTORE_STATUS_E2BIG, "E2BIG" }
 };
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
-#endif
 
 STATIC
 XENSTORE_STATUS