diff --git a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
index 16618a8f57..66ee590f42 100644
--- a/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
+++ b/OvmfPkg/Library/PlatformBootManagerLib/BdsPlatform.c
@@ -37,13 +37,6 @@ CONST UINT8 PciHostIrqs[] = {
   0x0a, 0x0a, 0x0b, 0x0b
 };
 
-//
-// Array Size macro
-//
-#ifndef ARRAY_SIZE
-#define ARRAY_SIZE(array) (sizeof (array) / sizeof (array[0]))
-#endif
-
 //
 // Type definitions
 //